下列哪个语句段能够画出曲面z=x^2/4-y^2/9?A.()[x,y]=meshgrid(-2:0.2:2,-3:0.25:3);()z=x^2/4-y^2/9;()mesh(x,y,z)()B.()x=-2:0.2:2;()y=-3:0.25:3()[xx,yy]=meshgrid(x,y);()z=x^2/4-y^2/9;()surf(x,y,z)()C.()x=-2:0.2:2;()y=-3:0.25:3()[xx,yy]=meshgrid(x,y);()z=xx.^2/4-yy.^2/9;()surf(x,y,z)()D.()x=-2:0.2:2;()y=-3:0.25:3()[xx,yy]=meshgrid(x,y);()zz=xx.^2/4-yy.^2/9;()surf(xx,yy,zz)