平面上有三个点集$$M$$，$$N$$，$$P$$：（~ ）．$$M=\left { \left( x,y \right)\textbar\textbar x\textbar+\textbar y\textbar\textless{}1 \right }$$，$$N=\left { \left( x,y \right)\textbar\sqrt{\left( x-\frac{1}{2} \right)+{{\left( y+\frac{1}{2} \right)}^{2}}},+\sqrt{{{\left( x+\frac{1}{2} \right)}^{2}}+{{\left( y-\frac{1}{2} \right)}^{2}}}\textless{}2\sqrt{2}, \right }$$，$$P=\left { \left( x,y \right)\textbar\textbar x+y\textbar\textless{}1,\textbar x\textbar\textless{}1,\textbar y\textbar\textless{}1 \right }$$则．
选项为:A:$$M\subset P\subset N$$；  B:$$M\subset N\subset P$$；  C:$$P\subset N\subset M$$；  D:$$\text{A,B,C}$$都不成立  请回答其中一个选项.