What term correctly completes the following sentence?
In an IEEE 802.11 frame, the IP packet is considered by the MAC layer to be a(n) _________.

A.
MAC Service Data Unit (MSDU)

B.
MAC Protocol Data Unit (MPDU)

C.
Bridge Protocol Data Unit (BPDU)

D.
PLCP Service Data Unit (PSDU)

E.
PLCP Protocol Data Unit (PPDU)