In the NSA networking, after the uplink LTE tallback feature is enabled, which of the following measurements is used by the gNodeB to trigger the process?

In the NSA networking, after the uplink LTE tallback feature is enabled, which of the following measurements is used by the gNodeB to trigger the process?
A . PUCCH SINR
B . SRS SINR
C . DMRS SINR
D . PUSCH SINR

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Answer: B