What is the mode of transcription of operon genes in the following genotypes?

For the following lac operon haploid genotypes identify the mode of transcription of operon genes and indicate determine whether the strain is lac + or lac- .

Part A:
I+P+O+ Z+Y+
   a) is lac- and the genes are inducibly transcribed.
   b) is lac + and the genes are not transcribed.
   c) is lac- and the genes are not transcribed.
   d) is lac + and the genes are constitutively transcribed.
   e) is lac+ and the genes are inducibly transcribed.
   f) is lac- and the genes are constitutively transcribed.


Part B:
I+P+OC Z−Y+
   a) is lac- and the genes are inducibly transcribed.
   b) is lac - and the genes are not transcribed.
   c)is lac + and the genes are not transcribed.
   d) is lac + and the genes are inducibly transcribed.
   e) is lac + and the genes are constitutively transcribed.
   f) is lac- and the genes are constitutively transcribed.

Part C:
I+P+O+ Z+Y−
   a) is lac + and the genes are constitutively transcribed.
   b) is lac- and the genes are not constitutively transcribed.
   c) is lac- and the genes are inducibly transcribed.
   d) is lac + and the genes are not transcribed.
   e) is lac- and the genes are not transcribed.
   f) is lac + and the genes are inducibly transcribed.


Part D:
I−P+OC Z+Y+
   a) is lac- and the genes are constitutively transcribed.
   b) is lac- and the genes are inducibly transcribed.
   c) is lac + and the genes are inducibly transcribed.
   d) is lac+ and the genes are constitutively transcribed.
   e) is lac- and the genes are not transcribed.
   f) is lac + and the genes are not transcribed.

Part E:
I+P−O+ Z−Y+
   a) is lac + and the genes are inducibly transcribed.
   b) is lac + and the genes are not transcribed.
   c) is lac- and the genes are constitutively transcribed.
   d) is lac- and the genes are inducibly transcribed.
   e) is lac + and the genes are constitutively transcribed.
   f) is lac- and the genes are not transcribed.

Part F:
I+P+OC Z+Y−
   a) is lac- and the genes are inducibly transcribed.
   b) is lac + and the genes are constitutively transcribed.
   c) is lac + and the genes are inducibly transcribed.
   d) is lac- and the genes are not transcribed.
   e) is lac + and the genes are not transcribed.
   f) is lac- and the genes are constitutively transcribed.

Part G:
I+P+OC Z+Y+
   a) is lac- and the genes are constitutively transcribed.
   b) is lac + and the genes are not transcribed.
   c) is lac- and the genes are not transcribed.
   d) is lac + and the genes are constitutively transcribed.
   e) is lac- and the genes are inducibly transcribed.
   f) is lac + and the genes are inducibly transcribed.


I would greatly appreciate an explanation of how to figure out these answers, in addition to the answers themselves, of course. Thank you!