Express as a Difference of Logarithms $\log _ { 7 } a ^ { 4 }$

Multiple Choice

Express as a difference of logarithms.
- $\log _ { 7 } a ^ { 4 }$

A) $\log ( 7 \cdot a \cdot 4 )$
B) $\log _ { 7 } a \cdot \log _ { 7 } 4$
C) $4 \log _ { 7 } a$
D) $\log 7 \cdot \log a \cdot \log 4$