As he is approaching age $65,$ Morris is discussing Medicare Advantage Plans with his financial adviser. The adviser mistakenly advises Morris that

A$)$

he must still enroll in Medicare Part A and B$.$

B$)$

he can enroll during specified enrollment periods throughout the year.

C$)$

he cannot enroll in a Medicare Advantage Plan if he has any preexisting conditions.

D$)$

if he goes outside of the network his services may not be covered, or his costs could be higher.