Expand into Sums And/or Differences of Logarithms $\log _ { 1 / 2 } ( a b c )$

Multiple Choice

Expand into sums and/or differences of logarithms. Assume all variables represent positive real numbers. $\log _ { 1 / 2 } ( a b c )$

A) $\frac { 1 } { 2 } \log a + \frac { 1 } { 2 } \log b + \frac { 1 } { 2 } \log c$
B) $\left( \log _ { 1 / 2 } a \right) \left( \log _ { 1 / 2 } b \right) \left( \log _ { 1 / 2 } c \right)$
C) $\log _ { 1 / 2 } a - \log _ { 1 / 2 } b - \log _ { 1 / 2 } c$
D) $\log _ { 1 / 2 } a + \log _ { 1 / 2 } b + \log _ { 1 / 2 } c$