Which option configures the secondary dial tone option for SRST mode to let the users hear the dial tone for PSTN calls?

Which option configures the secondary dial tone option for SRST mode to let the users hear the dial tone for PSTN calls?
A . voice service voip secondary dialtone 0
B . call-manager-fallback secondary dialtone 0
C . dial-peer voice 1 pots secondary dialtone 0
D . ccm-manager secondary dialtone 0

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Answer: B