单项选择题

华为KPI系统中,统计SDCCH占用请求次数的指标是()

A.K3015:CELL_KPI_TCH_AVAIL_NUM
B.K3004:CELL_KPI_SD_TRAF_ERL
C.K3001:CELL_KPI_SD_CONGEST
D.K3000:CELL_KPI_SD_REQ