刀具起点在(-40,-20)，从切向切入到(-20,0)点，铣一个? 40mm的整圆工件，并切向切出，然后到达(-40,20)点。判断正确的程序是。（ ）
AN010 G90 G00 G41 X-20.0 Y-20 D01; N020 G01 X-20.0 Y0 F200.0 ; N030 G02 X-20.0 Y0 I20.0 J0 ; N040 G01 X-20.0 Y20 ; N050 G00 G40 X-40.0 Y20.0;
BN010 G90 G00 G41 X-20.0 Y-20 D01; N020 G01 X-20.0 Y0 D01 F200.0 ; N030 G02 X-20.0 Y0 I-20.0 J0 ; N040 G01 X-20.0 Y20 ; N050 G00 G40 X-40.0 Y20.0;
CN010 G90 G00 X-20.0 Y-20 ; N020 G01 X-20.0 Y0 F200.0 ; N030 G02 X-20.0 Y0 I-20.0 J0 ; N040 G01 X-20.0 Y20.0; N050 G00 G40 X-40.0 Y20.0;
DN010 G90 G00 X-20.0 Y-20.0 ; N020 G91 G01 G41 X20.0 Y0 D01 F200.0 ; N030 G02 X-20.0 Y0 I20.0 J0 ; N040 G01 X-20.0 Y20.0; N050 G00 G40 X-40.0 Y20.0;