假设2FSK系统和2ASK系统的都采用包络检波解调，而且两种数字调制方式的解调端带通滤波器输出的平均信噪比相同，则以下说法正确的是

A.2ASK

B.2FSK

C.2PSK

D.2DPSK

A.2FSK, 2PSK

B.2PSK, 2PSK

C.2FSK, 2ASK

D.2ASK, 2FSK

A.2ASK,2FSK,2PSK,2DPSK

B.2DPSK,2PSK,2FSK,2ASK

C.2PSK,2DPSK,2FSK,2ASK

D.2DPSK,2PSK,2ASK,2FSK

A.2ASK

B.2FSK

C.2PSK

D.2DPSK

A.2ASK

B.2FSK

C.2PSK

D.2DPSK

A.2bits/s/Hz

B.4bits/s/Hz

C.1bits/s/Hz

D.0.5bits/s/Hz

A.4500Hz

B.2000Hz

C.2250Hz

D.3000Hz

A.误信率

B.误码率

C.发射功率

D.带宽

A.2ASK

B.4ASK

C.16ASK

D.32ASK