what is causing this behavior?

— Exhibit —
user@router# show class-of-service
classifiers {
inet-precedence ipp-test {
import default;
forwarding-class best-effort {
loss-priority low code-points be;
}
forwarding-class expedited-forwarding {
loss-priority low code-points af21;
}

forwarding-class assured-forwarding {
loss-priority low code-points af11;
}
forwarding-class network-control {
loss-priority low code-points nc1;
}
}
}
user@router# show firewall
filter MF {
term 1 {
from {
precedence 0;
}
then forwarding-class best-effort;
}
term 2 {
from {
precedence 5;
}
then forwarding-class expedited-forwarding;
}
term 3 {
from {
precedence 2;
}

then forwarding-class assured-forwarding;
}
term 4 {
from {
precedence 6;
}
then forwarding-class network-control;
}
term 5 {
then accept;
}
}
user@router> show class-of-service
…
Code point type: inet-precedence
Alias Bit pattern
af11 001
af21 010
af31 011
af41 100
be 000
cs6 110
cs7 111
ef 101
nc1 110
nc2 111

— Exhibit —

Refer to the Exhibit.
Traffic with the IPP value af21 should be assigned to the expedited forwarding queue; however,
this traffic is not being assigned to that queue.
Referring to the exhibit, what is causing this behavior?

A.
The af21 traffic is assigned to the assured forwarding queue because of the BA classifier.

B.
The af21 traffic is assigned to the assured forwarding queue because of the MF classifier.

C.
The af21 traffic is assigned to the best effort queue because of the MF classifier.

D.
The af21 traffic is assigned to the best effort queue because of the BA classifier.

Explanation: