For what least integral \( k \) is the quadratic trinomial \( (k-2) x^{2}+8 x+(k+4) \) is positi...

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For what least integral \( k \) is the quadratic trinomial \( (k-2) x^{2}+8 x+(k+4) \) is positive for all real values of \( x \) ?
(a) \( k=4 \)
(b) \( k=5 \)
(c) \( k=3 \)
(d) \( k=6 \)
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