Which of these statements is correct about the function $g$ if both of the functions $f$ and $f$@$g$ are one$-$to$-$one?

Multuple Choice

$g15$ not one$-$to$-$one.

$g$ is one$-$to$-$one as fis one$-$to$-$one.

$g$ is one$-$to$-$one and onto as fo gis one$-$to$-$one.

gls one$-$to$-$one as fo gls one$-$to$-$one.