Point$-$to$-$Point Tunneling Protocol $($PPTP$)$ relies on which of the following to build a virtual private network tunnel between communicating entities?

Question $99$Answer

a$.$

Transport Layer Security $($TLS$)$

b$.$

Point$-$to$-$Point Protocol $($PPP$)$

c$.$

Generic Routing Encapsulation $($GRE$)$

d$.$

Layer $2$ Tunneling Protocol $($L$2$TP