Why is $Abscisic$ $acid$ $(ABA)$ also known as a stress hormone?

(N/A) $Abscisic$ $acid$ $(ABA)$ is known as a stress hormone because it plays a crucial role in helping plants cope with adverse environmental conditions.
$1$. It induces the closure of stomata during water stress,thereby reducing water loss through transpiration.
$2$. It increases the tolerance of plants to various stresses such as drought,salinity,and extreme temperatures.
$3$. It promotes seed dormancy,which ensures that seeds do not germinate under unfavorable conditions and helps them withstand desiccation.
$4$. It induces dormancy in buds and promotes the abscission (shedding) of leaves,fruits,and flowers at the end of the growing season to conserve energy.