Prior to association, what parameter can 802.11 client devices measure and use to select the optimal access point for association?

Prior to association, what parameter can 802.11 client devices measure and use to select the optimal access point for association?
A . Signal strength of access point beacons received
B . Proximity to potential access points
C . Retry rate of probe request and response frames
D . Average round trip time to reach the Internet DNS server
E . Average round trip time to reach the IP router

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Answer: A