Transcription rates with a combination of enhancers + activators vs silencers + repressors?
a) Increased by enhancers + activators, decreased by silencers + repressors
b) Decreased by enhancers + activators, increased by silencers + repressors
c) Increased by both enhancers + activators and silencers + repressors
d) Decreased by both enhancers + activators and silencers + repressors