设置PDCCH信道是否使用发射分集的参数是
（）
ACell Open-loop Spatial Multiplexing Used Indicator
BTransmit Diversity Indicator for Common Channel
C Cell transmit Diversity Used Indicator
DCell Closed- loop Spatial Multiplexing Used Indicator
ACell Open-loop Spatial Multiplexing Used Indicator
BTransmit Diversity Indicator for Common Channel
C Cell transmit Diversity Used Indicator
DCell Closed- loop Spatial Multiplexing Used Indicator