Mateo is testing a new biometric security control. In his testing, $10$

authorized users attempted to access the facility; $9$ of them were

granted access while $1$ was denied access. Ten unauthorized users

also attempted to access the facility but all were turned away.

What is the false rejection rate $($FRR$)$ of this control?

$0\%$

$10\%$

$100\%$

$90\%$