PTN equipment realizes the unified bearing of multiple services through PWE3. For users, the PTN equipment is equivalent to a Layer 2 switch at this time.

PW APS bundling can reduce APS resource consumption and increase the speed of batch service switching.
Which of the following descriptions about PW APS bundling are correct? (multiple choice)

In ODUk SNCP protection, for circuit board or line fiber failure, each fault detection point at the receiving end reports the event, and the cross-connect board controls the selective reception to complete the switching action.

Which of the following is not a simple flow classification

SDH equipment mainly has two platforms, 4.0 and 5.0. In the main control board replacement, the replacement steps under different platforms are different. Which of the following operations are specific to the 5.0 platform?