impany provides Software as a Service $($SaaS$),$ The company provides this service through a private, on$-$premises cloud model in order to meet data urity requirements. Recently, they have experienced some unexpected spikes in demand that have nearly saturated their private cloud. The company opts an approach to meeting service requirements by adding additional standby servers on company premises.

wich approach have they adopted?

Hortrontat scaling

Yertical sealing

Coud bursting

Auto$-$scaling

I want to review this question later. $($Optional$)$