b. We shall have no obligation to defend the "insured" in such "suit" until the "insured's" losses, which exclude any costs of investigation, settlement or defense have exceeded the "certified act of terrorism retained limit". Once such losses have exceeded the "certified act of terrorism retained limit", we will assume charge of the settlement or defense of any such "suit". We may make such investigation as we require and effect settlement of any "suit" so defended.

c. We shall not be obligated to defend any "suit" after the applicable limits of this policy have been exhausted.

All other terms and conditions of this policy remain unchanged.