Consider an input signal containing frequencies $25Hz,45Hz,75Hz$ and $130Hz$ and is sampled

at a rate of $120Hz.$

Which frequency$($ies$)$ undergoes$($o$)$ aliasing and what are their respective alias frequencies?

All frequencies undergo aliasing.

$25Hz$ alias to $35Hz$

$45Hz$ alias to $15Hz$

$75Hz$ alias to $45Hz$

$130Hz$ alias to $10Hz$

Only $25Hz$ and $45Hz$ under go aliasing

$25Hz$ alias to $35Hz$

$45Hz$ alias to $15Hz$

$75Hz$ remains $75Hz$

$130Hz$ remains $10Hz$

Only $75Hz$ and $130Hz$ under go aliasing

$25Hz$ remains $25Hz$

$45Hz$ remains $45Hz$

$75Hz$ alias to $45Hz$

$130Hz$ alias to $10Hz$