Which two metrics does the engineer verify to ensure that the wireless network can support voice services?

A wireless engineer is performing a post verification of a wireless network .

Which two metrics does the engineer verify to ensure that the wireless network can support voice services? (Choose two.)
A . The coverage area must have a noise floor that does not exceed -87 dBm.
B . The client device must have at least an -67 dBm RSS
D . The rate of retransmitted packets must be 15 percent or below.
E . The rate of retransmitted packets must be 20 percent or below.
F . The client device must have at least an -65 dBm RSS

Answer: B,D