If \( a, b, c, d \) are positive real numbers such that \( a+b+c \) \( +d=2 \), then \( M=(a+b)(...

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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
(A) \( 0 \leq M \leq 1 \)
(B) \( 2 \leq M \leq 3 \)
(C) \( 1 \leq M \leq 2 \)
(D) \( 3 \leq M \leq 4 \)
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