[单选题]
An object is placed 15 cm from a co66zbu4s0 t6bvspmwcy 1;3tx oncave mirror of focal length 20 cm. Thez kwz0l kxd: 8c;sizyj1 r;.h6 object is 4.0 cm ta i0jxzrh; wz6: 18s kd.c;kzylll. Where is the image located?
A. 12 cm behind the mirror
B. 12 cm in front of the mirror
C. 60 cm behind the mirror
D. 60 cm in front of the mirror
