Let \( p, q, r, s \) be real numbers such that \( p r=2(q+ \) \( s)...

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Let \( p, q, r, s \) be real numbers such that \( p r=2(q+ \)
\( s) \). Consider quadratic equations \( x^{2}+p x+q=0 \) and \( x^{2}+r x+s=0 \). Then
(a) none of these has real roots
(b) both have real roots
(c) at least one has real roots
(d) at most one has real roots
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