What is the reliability of the following system?

A Reliability Block Diagram with $5$ subsystems.A Reliability Block Diagram with $5$ subsystems. The reliability value for each system, from left to right, is as follows: $0\mathrm{.}7,0\mathrm{.}7,0\mathrm{.}9,0\mathrm{.}9$ and $0\mathrm{.}8.$

Series Reliability$=($p$1)($p$2)($p$3)...($pn$)$

Parallel Reliability$=1-(1-$p$1)(1-$p$2)(1-$p$3).....(1-$pn$)$

Multiple Choice

$0\mathrm{.}504$

$0\mathrm{.}70$

$\mathrm{.}7207$

$0\mathrm{.}8$

$\mathrm{.}9901$