If we push $\text{'}$C$\text{'},\text{'}$S$\text{'},\text{'}$U$\text{'},\text{'}$S$\text{'}$ and $\text{'}$B$\text{'}$ onto a stack, what the sequence will be popped out when pop$()$ is called repeatedly until the stack is empty?

Group of answer choices

USBCS

BSUSC

CSUSB

CSBSU