What is a major difference between PVST and PVST+?

A.
PVST supports dot1q and PVST+ does not.

B.
PVST+ supports 802.1q and ISL.

C.
PVST supports only 802.1q and doesn’t support ISL

D.
PVST+ is an enhancement to the 802.1Q specification and is not supported on non-Cisco devices and PVST uses ISL Trunking.