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Let n(k) be the number of real solution ...

Let `n_(k)` be the number of real solution of the equation `|x+1| + |x-3| = K`, then

A

`n_(k) = 0`, if `K lt 4`

B

`n_(k) = 2` if `K gt 4`

C

`n_(k)` is infinitely many if K = 4

D

Minimum value of `f(x) = |x+1| + |x-3|` is 2

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The correct Answer is:
A, B, C
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