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

Multiple Choice

Decide whether the equation is "conditional," an "identity," or a "contradiction." Give its solution set.
- $3 ( 5 f + 9 ) = 15 f + 27$

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