Which of the following are the advantages of PPTP.

(A). PPTP typically requires a router with PPTP Passthrough, as it doesn't natively work with Network Address Translation (NAT).

(B). PPTP is known for its fast VPN protocol.

(C).  PPTP connections can be easily blocked by firewalls, making them susceptible to disruptions in network accessibility.

(D).  PPTP allows the separation of ISDN cards and modems from other servers, leading to fewer devices to purchase and manage.