How does phosphodiesterase affect cAMP levels in GPCR signaling pathways?

• A. Phosphodiesterase has no effect on cAMP levels.
• B. Phosphodiesterase degrades cAMP, reducing its levels.
• C. Phosphodiesterase synthesizes cAMP, increasing its levels.
• D. Phosphodiesterase converts cAMP to ATP.

Answer: (B)