Regal Homebuilders is insured under a CGL with a $$5$ million general aggregate limit of insurance. At the request of a client, Regal attaches a designated construction project general aggregate limit endorsement to the policy, naming the client in the schedule. How does this endorsement change the coverage available under Regal's policy?

a$.$ It provides separate general and products$-$completed operations aggregate limits that apply exclusively to the project listed in the endorsement schedule.

b$.$ It doubles the amount of coverage available to pay claims arising out of the project listed in the endorsement schedule.

c$.$ It provides a separate general aggregate limit that applies exclusively to claims arising out of the project listed in the endorsement schedule.

d$.$ It provides additional insured status to the person or entity listed in the endorsement schedule and provides a separate limit of insurance that applies exclusively to claims made against that person or entity.