If \[a,\,b,\,c,\,d\] are positive real numbers such that \[a+b+c+d\] \ – McqOptions

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1.	If \[a,\,b,\,c,\,d\] are positive real numbers such that \[a+b+c+d\] \[=2,\] then \[M=(a+b)(c+d)\] satisfies the relation [IIT Screening 2000]
A.	\[0<M\le 1\]
B.	\[1\le M\le 2\]
C.	\[2\le M\le 3\]
D.	\[3\le M\le 4\]
Answer» B. \[1\le M\le 2\]

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