TMS320F28379D: About ADC simultaneous conversion

Part Number:TMS320F28379D

Hi, 

I have launchpad TMS320F28379D. It has 15 ADCIN and they are indicated with the letters A, B and C.

My question is: how many acquisitions can I do simultaneously at the same instant of time t? Only 3 (one for  A, one for B and one for C), 15 (Using 15 different SOC, one for each ADCIN) or none (they are all sequential)??

Thanks for reply.