Find the Value of the Expression $\log _ { \mathrm { b } } \mathrm { A } = 3$

Multiple Choice

Find the value of the expression.
-Let $\log _ { \mathrm { b } } \mathrm { A } = 3$ and $\log _ { \mathrm { b } } \mathrm { B } = - 4$ . Find $\log _ { \mathrm { b } } \mathrm { AB }$ .

A) $- 1$
B) 12
C) 7
D) $- 12$