The ML-series Ethernet card on the ONS 15454 provides up to （）active Q-in-Q instances per card.

A.line timing
B.loop timing
C.internal timing
D.through timing
E.external timing

A.2
B.3
C.4
D.20
E.22
F.24

A. VT circuits
B. STS circuits
C. VT tunnel circuits
D. 1:1 protection circuits
E. 1:N protection circuits