When planning a 1+1 HSB, corresponding planning principles should be followed. Which of the following are not planning principles for HSB?

When planning a 1+1 HSB, corresponding planning principles should be followed. Which of the following are not planning principles for HSB?
A . If the protection type is recovery, it is recommended to set the waiting recovery time to 5 to 12 minutes. The recommended setting is the default value of 10 minutes.
B . It is recommended to enable reverse switching to prevent invalid RDI switching at the transmitting end due to signal fading.
C . It is recommended to set "Alarm reporting mode" to "Protection group reporting only"
D . Although 1+1 HSB has no restrictions on the slots of the IF boards, it is still recommended that the master and backup IF boards be installed in the dual slots.

Answer: B