Decide Whether the Equation Is Conditional, an Identity, or a Contradiction

Decide whether the equation is conditional, an identity, or a contradiction. Give the solution set.
- $12 m+4=2(4 m-4)$

A) Conditional; $\{-3\}$
B) Contradiction; $\varnothing$
C) Conditional; $\{1\}$
D) Identity; {all real numbers}