Which of the following descriptions about 5G NSA networking is correct?

Option 3 is recommended for Option 3/3a/3x networking because it does not need to transform the existing LTE network

Option 3, 7, and 4 have different anchor points on the signaling plane. The radio is in LTE, eLTE, and NR, respectively; the core network is in EPC+, EPC+, and 5GC.

Option4 networking, suitable for the initial stage of network construction, LTE coverage is relatively weak.

Option3a/7a are both EPC offloading. The advantage is that they can be offloaded for different services, but the disadvantage is that EPC cannot be offloaded according to the wireless link status.