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设有日期类型字段 rq，日期格式为 mm/dd/yyyy。在以下四组命令当中，各条命令功能完全等效的是
A
1.LIST FOR SUBSTR(DTOC(rq),4,4)="2001" 2.LIST FOR YEAR(rq)=2001 3.LIST FOR "2001"$DTOC(rq)
B
1. LIST FOR SUBSTR(DTOC(rq),7,4)="2001" 2.LIST FOR YEAR(rq)=2001 3.LIST FOR "2001"$DTOC(rq)
C
1.LIST FOR SUBSTR(DTOC(rq),1,4)="2001" 2. LIST FOR YEAR(rq)="2001" 3.LIST FOR "2001"$DTOC(rq)
D
1. LIST FOR SUBSTR(DTOC(rq),7,4)="2001" 2.LIST FOR YEAR(rq)=2001 3.LIST FOR "2001"$rq
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