“Please add a 0-1 variable to express the relationship between these two mutual exclusive constraints: x1≥0 or x1≤-20（ ）。

A、My≤x1,x1+20≤M(1-y),y=0 or 1,M is a sufficiently large positive number
B、-My≤x1,x1+20≤M(1-y),y=0 or 1,M is a sufficiently large positive number
C、My≤x1,x1+20≥M(1-y),y=0 or 1,M is a sufficiently large positive number
D、x1≤-My,x1+20≤M(1-y),y=0 or 1,M is a sufficiently large positive number