下列算法是用中点 Bresenham 绘制第一象限的八分之一黑色圆弧 , 圆弧宽 3 个像素。请选择正确的语句完成算法。正确的语句选项是() void CTestView::MBCircle(int R,CDC *pDC)// 圆中点 Bresenham 算法 { int x,y; double d; d=1.25-R;x=0;y=R; for(x=0;x<=y;x++) { if (d<0) d+=2*x+3; else { d+=2*(x-y)+5; y--; } } } (1) pDC->SetPixelV(x,y,RGB(0,0,0)); (2) pDC->SetPixelV(x+1,y,RGB(0,0,0)); (3) pDC->SetPixelV(x,y+1,RGB(0,0,0)); (4) pDC->SetPixelV(x-1,y,RGB(0,0,0)); (5) pDC->SetPixelV(x,y-1,RGB(0,0,0)); (6) pDC->SetPixelV(x+3,y+3,RGB(0,0,0));