What is the most common cause for a Quick mode packet 1 failing with the error "No Proposal Chosen" error?

What is the most common cause for a Quick mode packet 1 failing with the error "No Proposal Chosen" error?
A . The OS and patch level of one gateway does not match the other.
B . The previously established Permanent Tunnel has failed.
C . There is a network connectivity issue.
D . The encryption strength and hash settings of one peer does not match the other.

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Answer: D