The Worker Adjustment and Retraining Notification Act $($WARN$)$ notice requirements do not apply when:

a$.$ a plant closing will risult in an employment loss for $50$ or more workers at one site within a $30$day period.

b$.$ a plant closing will result in an employment loss for less than $25$ workers at one site within a $60$ day period.

c$.$ a mass layoff involves at least $33$ percent of the workforce $($minimum of $50$ employees$)$ within any $30-$day period.

d$.$ a mass layoff involves at least $500$ employees within any $30-$day period.