\( f: R \rightarrow R \) and \( g:[0, \infty) \rightarrow R \) is defined by \( f(x)=x^{2} \) and \( g(x)=\sqrt{x} \). Which one of the following is
not true?

• Correct answer
  A

  fo \( g(-4)=4 \)
• B

  g of \( (-2)=2 \)
• C

  \( g \circ f(4)=4 \)
• D

  fo \( g(2)=2 \)

Hence, the correct answer is option: 'A'.