After his old boat sprang a leak and had to be trashed, Gilligan bought a new boat for $$5,000.$ Gilligan had a $2011$ edition HO $3$ policy that adequately covered his old boat, but he now has a $2022$ edition HO $3$ policy. Does Gilligan need a separate policy to protect his $$5,000$ investment in the new boat?

a$.$ No; although Gilligan$$s HO $3$ has a $$1,500$ sublimit on watercraft, his insurer can add an endorsement increasing this sublimit to $$5,000.$

b$.$ No; although Gilligan$$s HO $3$ has a $$2,000$ sublimit on watercraft, his insurer can add an endorsement increasing this sublimit to $$5,000.$

c$.$ Yes; Gilligan$$s HO $3$ has a $$1,500$ sublimit on watercraft, which does not adequately meet his needs.

d$.$ Yes; Gilligan$$s HO $3$ has a $$2,000$ sublimit on watercraft, which does not adequately meet his needs.