Which TWO VPN $($Virtual Private Network$)$ tunneling protocols are used with IPsec to increase the security of the transmissions?

Question $22$

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a$.$ Open VPN and IKEv$2(($Internet Key Exchange$)$ v$2$

b$.$ L$2$TP $($Layer $2$ Tunneling Protocol$)$ and GRE $($Generic Routing Encapsulation$)$

c$.$ PPTP $($Point$-$to$-$Point Tunneling Protocol$)$ and PPP $($Point$-$to$-$Point Protocol$)$

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Ouestion $23$

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a$.$ Hot$-$swappable parts

b$.$ Clustering

c$.$ Load balancing

d$.$ Automatic failover

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