单项选择题

A.ALTBOUT=1AEQBOUT=0AGTBOUT=0
B.ALTBOUT=1AEQBOUT=1AGTBOUT=0
C.ALTBOUT=0AEQBOUT=1AGTBOUT=1
D.ALTBOUT=0AEQBOUT=0AGTBOUT=1