请选择ABCD9K:x:V.P8i st ____ m ____ ch1O)N2[5H'r3@2t7X+D
A. a, o1O)N2[5H'r3@2t7X+D
B. o, a1O)N2[5H'r3@2t7X+D
C. u, o1O)N2[5H'r3@2t7X+D
D. a, u1O)N2[5H'r3@2t7X+D