For what values of a , the function f(x)...

For what values of `a ,` the function `f(x)={((sqrt(a+4))/(1-a))x^5-3x+"log"(5)` decreases for all real `xdot`

A

`(-oo,oo)`

B

`[-4,(3-sqrt21)/(2)] cup (1,oo)`

C

`[-3, (5-sqrt27)/(2)] cup (2,oo)`

D

`(1,oo)`

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The correct Answer is:

B

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