Annuities math question

Remember the following points:

• An ordinary annuity is the annuity where regular deposit of amount is made at the end of the period.
• In a simple ordinary annuity payment interval is same as interest period.
• In a general ordinary annuity payment interval is different from the interest period.

[a] Here regular payment is not made, hence its not an annuity, hence answer is
[NEITHER]

[ b] Here periodic payment is made at the end of the week and interest period and payment period both are weekly, hence its a
[SIMPLE ORDINARY ANNUITY]

[c] Here yearly deposit is made at the end of the year and compounding period is also annually hence its a
[SIMPLE ORDINARY ANNUITY]

[d] Since payment is made at the starting of the month, hence its not an ordinary annuity, its an annuity due, hence correct answer is
[NEITHER]

[e] Here periodic payment is made at the end of the bi-week but compounding period is monthly, hence its
[GENERAL ORDINARY ANNUITY]