The primary difference between an enhancer and a promoter-proximal element is that:

The primary difference between an enhancer and a promoter-proximal element is that
A) enhancers are transcription factors, while promoter-proximal elements are DNA sequences.
B) enhancers enhance transcription, while promoter-proximal elements inhibit transcription.
C) enhancers are part of the promoter, while promoter-proximal elements are regulatory sequences distinct from the promoter.
D) enhancers are at considerable distances from the promoter and can be moved or inverted and still function, while promoter-proximal elements are close to the promoter and their position and orientation must be maintained.
E) enhancers are DNA sequences, while promoter-proximal elements are proteins that bind proximal to the promoter.