The air fryer won't work if component QK fails. Current component QK$\text{'}$s reliability is $0\mathrm{.}95.$ Every other part of the appliance is $100$ percent reliable. What is the reliability of the air fryer if you added a backup QK which had a reliability of $\mathrm{.}90?$

$\mathrm{.}9025$

$\mathrm{.}90$

$\mathrm{.}9975$

$\mathrm{.}95$

$\mathrm{.}995$