Which parameters are valid SCREEN options for combating operating system probes?()

A、 syn-fin, syn-flood, and tcp-no-frag
B、 syn-fin, port-scan, and tcp-no-flag
C、 syn-fin, fin-no-ack, and tcp-no-frag
D、 syn-fin, syn-ack-ack-proxy, and tcp-no-frag