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Leg f(x+y)=f(x)+f(y)fora l lx , y in R ...

Leg `f(x+y)=f(x)+f(y)fora l lx , y in R ,` If `f(x)i scon t inuou sa tx=0,s howt h a tf(x)` is continuous at all `xdot`

A

(-∞,∞)

B

(0,∞)

C

(-∞,0)

D

(2,∞)

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The correct Answer is:
A
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