Assuming a full iBGP mesh in ISP 1, how does router R1 in ISP 1 handle a BGP update received from ISP 2?

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Assuming a full iBGP mesh in ISP 1, how does router R1 in ISP 1 handle a BGP update received from ISP 2?
A . The update is sent to router R2 in ISP 1.
B . The update is sent to routers R2 and R3 in ISP 1.
C . The update is sent to all routers in ISP 1.
D . The update is sent to routers R2 and R3 in ISP 1, and to router R3 in ISP 2.

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Answer: C