The 4G Mobile Subscriber measures these parameter in air interface..a.RSCP and Ec/Nob.RxLev and RxQualc.RSRP and RSRQd.RSCP and RSRQ

The parameters measured by a 4G Mobile Subscriber in the air interface are RSRP (Reference Signal Received Power) and RSRQ (Reference Signal Received Quality). So, the correct answer is c. RSRP and RSRQ.

Here's a step-by-step explanation:

1. RSRP is a measure of the average power level received from a single Reference signal, and it's used for signal strength measurement.
2. RSRQ is a measure of the quality of the received signal, and it's used for cell selection, reselection and handover.
3. Both RSRP and RSRQ are important for the proper functioning of a 4G network, as they help the network to maintain a good connection quality for the mobile subscriber.