यदि $f(x)$ एक ऐसा फलन है कि $f^{\prime \prime}(x)+f(x)=0$ और $g(x)=[f(x)]^{2}+[f^{\prime}(x)]^{2}$ तथा $g(3)=8$ है,तो $g(8)$ का मान क्या होगा?

  • A
    $0$
  • B
    $3$
  • C
    $5$
  • D
    $8$

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