What is the purpose of configuring a triggered-policy on an Alcatel-Lucent 7750 SR?

What is the purpose of configuring a triggered-policy on an Alcatel-Lucent 7750 SR?
A . Policy changes are delayed until the peer router with the affected routes reboots.
B . Policy changes are delayed until route updates for affected BGP routes are received from peers.
C . Policy changes are delayed until BGP sessions are cleared or BGP is reset.
D . Policy changes are delayed until the router reboots.

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Answer: C