Let $R^3$ denote the three-dimensional space. Take two points $P=(1,2,3)$ and $Q=(4,2,7)$. Let dist $(X, Y)$ denote the distance between two points $X$ and $Y$ in $R^3$. Let
$S=\left\{X \in R^3:(\operatorname{dist}(X, P))^2-(\operatorname{dist}(X, Q))^2=50\right\}$ and
$T=\left\{Y \in R^3:(\operatorname{dist}(Y, Q))^2-(\operatorname{dist}(Y, P))^2=50\right\}$
Then which of the following statements is (are) TRUE?