The IEEE 802.11 Pairwise Transient Key (PTK) is derived from what cryptographic element?

A.
Phase Shift Key (PSK)

B.
Group Master Key (GMK)

C.
Pairwise Master Key (PMK)

D.
Group Temporal Key (GTK)

E.
PeerKey (PK)

F.
Key Confirmation Key (KCK)