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Two functions f:Rrarr R, g:R rarr R are ...

Two functions `f:Rrarr R, g:R rarr R` are defined as follows :
`f(x)={{:(0,"(x rational)"),(1,"(x irrational)"):}," " g(x)={{:(-1,"(x rational)"),(0,"(x irrational)"):}` then `(fog)(pi)+(gof)(e)=`

A

0

B

`-1`

C

2

D

1

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The correct Answer is:
B
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