If a ,b ,c ,d are positive real umbers s...

If `a ,b ,c ,d` are positive real umbers such that `a=b+c+d=2,t h e nM=(a+b)(c+d)` satisfies the relation `0lt=Mlt=1` `1lt=Mlt=2` `2lt=Mlt=3` `3lt=Mlt=4`

A

`0 lt M le 1 `

B

`1 le M le 2`

C

`2 le M le 3`

D

`3 le M le 4`

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A

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