Consider a process system with $$op $=20\%,$ a slope of $20\%$ and a lag time of $1/3$ of a minute. $$The gain for a P controller using the Ziegler$-$Nichols algorithm is:

Group of answer choices

$1\mathrm{.}21$

$2\mathrm{.}90$

$3\mathrm{.}00$

$2\mathrm{.}18$

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