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If function \(f(x)\) satisfies \(f(x)=f(x^2)\) for all \(x,\) which of the following must be true?
A. \(f(4)=f(2)f(2)\)
B. \(f(16)-f(-2)=0\)
C. \(f(-2)+f(4)=0\)
D. \(f(3)=3f(3)\)
E. \(f(0)=0\)
Answer: B
Source: GMAT Club Tests
A. \(f(4)=f(2)f(2)\)
B. \(f(16)-f(-2)=0\)
C. \(f(-2)+f(4)=0\)
D. \(f(3)=3f(3)\)
E. \(f(0)=0\)
Answer: B
Source: GMAT Club Tests
