Which protection of the following PTN equipment belongs to bundling multiple ports with links to provide higher bandwidth and reliability? (Multiple choice)

Which protection of the following PTN equipment belongs to bundling multiple ports with links to provide higher bandwidth and reliability? (Multiple choice)
A . OAM/BFD
B . Tunnel APS/PW APS
C . LAG/ML-PPP
D . LAG/MC-LAG

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Answer: CD