Let \( f: N \rightarrow N \) where \( N \) is set of natural number...

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Let \( f: N \rightarrow N \) where \( N \) is set of natural numbers be a function such that \( f(x+y)=f(x y) \forall x \geq 4 \) and \( y \geq 4 \), then
a) \( f(4)=f(5) \)
b) \( f(8)=f(9) \)
c) \( f(7)=f(8) \)
d) \( f(5)=f(6) \)
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