Which statement accurately compares the effects of cholera toxin and pertussis toxin?

Both toxins inhibit adenylate cyclase activity.

Both toxins decrease cAMP production.

Cholera toxin decreases adenylate cyclase activity, while pertussis toxin increases it.

Cholera toxin increases adenylate cyclase activity by inhibiting GTPase activity, while pertussis toxin increases adenylate cyclase activity by inhibiting GDP-GTP exchange.