Ralph fortunately collects enough money from home sharing guests to cover the rent on his city apartment. Unfortunately, one of the guests was accompanied by bedbugs. The bedbugs remained when the guest moved out, and Ralph must now pay an exterminator $$500$ in remediation fees. Ralph is the named insured in an HO $4$ policy that

a$.$ provides no coverage for bedbug remediation.

b$.$ covers bed bug remediation for up to $$500$ per policy period.

c$.$ covers bed bug remediation for up to $$500$ per remediation.

d$.$ covers bed bug remediation for up to $$500$ subject to a $$500$ deductible.