Let g(x) be the reflection of f(x)=x^2+5 in the x-axis. What is a function rule for g(x)?

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Let g(x) be the reflection of f(x)=x^2+5 in the x-axis. What is a function rule for g(x)?

A. g(x)=-x^2-5
B. g(x)=x^2+5
C. g(x)=x^2-5
D. g(x)=-x^2+5