Using the probability approach to determine an inventory safety stock and wanting to be $95$ percent sure of covering inventory demand, which of the following is the number of standard deviations necessary to have the $95$ percent service probability assured?

Multiple Choice

$1\mathrm{.}96$

$2\mathrm{.}18$

$$

$$

$1\mathrm{.}28$

$$

$2\mathrm{.}00$