执行MOV AX ，WDAT 指令，要使AX寄存器中内存为3412H，不能采用下列哪种数据定义？ A) DSEG SEGMENT WDAT EQU WORD PTR BDAT BDAT DB 12H，34H DSEG ENDS B) DESG SEGMENT BDAT DB 12H，34H WDAT = WORD PTR BDAT DSEG ENDS C) DESG SEGMENT WDAT EQU THIS WORD BDAT DB 12H，34H DSEG ENDS D) DESG SEGMENT BDAT DB 12H，34H WDAT LABEL WORD DESG EBDS