Two design options of a parallel system. The first parallel system is titled, Design Option B$.$ It shows two components, $0\mathrm{.}9$ and $0\mathrm{.}95,$ connected in series at the top and two components, $0\mathrm{.}9$ and $0\mathrm{.}95,$ connected in series at the bottom. The second parallel system is titled, Design Option C$.$ It shows two parallel systems connected in series. The first parallel system comprises two identical components, $0\mathrm{.}9.$ The second parallel system comprises two identical components, $0\mathrm{.}95.$

$1.$ Find the reliability of the original design.

$2.$ Explain how the configurations of the proposed designs differ.

$3.$ Which proposed design has the best reliability?