How do the stimulatory and inhibitory pathways of adenylate cyclase GPCR signaling differ in their effects on cAMP levels?

• A. Both pathways increase cAMP levels.
• B. Stimulatory increases cAMP levels, inhibitory decreases them.
• C. Stimulatory decreases cAMP levels, inhibitory increases them.
• D. Both pathways decrease cAMP levels.

Answer: (B)