以下电报里N/M的意思是（ ） ZCZC 5HK0041 260552 GG ZGGGUDXX 260552 ZBBBCKXX ATTN:GDO/D CSN SEP N/M FLIGHT PLAN AS FLW: AIRCRAFT TYPE:B77F DATE AND SKED:PEK TIME 1.CSN8710 ZSPD0415 0545ZHCC ON 07/14/21/28SEP2015 FLIGHT ROUTE:AS SKED FLIGHT LEVEL:AS SKED PLS ENSURE/WLK/87786586
A.调机
B.客运包机
C.货运包机
D.客运加班
正确答案是A