单项选择题

A.cowpatty -r wpacrack.cap -f yuan.pmk
B.cowpatty -r wpacrack.cap -f yuan.pmk -s "ZJXZ"
C.cowpatty -r wpacrack.cap -d yuan.pmk -s ZJXZ
D.cowpatty -r wpacrack.cap -d yuan.pmk