examday

/TMUA

$S(x)$ is a property of a real number $x$, and exactly one of the following four claims about $S$ is true. Which one?

A: $S(x)$ holds whenever $x^2<4$.

B: $S(x)$ holds precisely when $x^2<4$.

C: $S(x)$ holds whenever $x^2<9$.

D: $S(x)$ holds precisely when $x^2<9$.