Which of the following function(s) defined below has/have single point continuity. P (A) \( f(x)...

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Which of the following function(s) defined below has/have single point continuity.
P
(A) \( f(x)=\left[\begin{array}{ll}1 & \text { if } x \in Q \\ 0 & \text { if } x \notin Q\end{array}\right. \)
W
(B) \( g(x)=\left[\begin{array}{cl}x & \text { if } x \in Q \\ 1-x & \text { if } x \notin Q\end{array}\right. \)
(C) \( h(x)=\left[\begin{array}{ll}x & \text { if } x \in Q \\ 0 & \text { if } x \notin Q\end{array}\right. \)
(D) \( k(x)=\left[\begin{array}{cl}x & \text { if } x \in Q \\ -x & \text { if } x \notin Q\end{array}\right. \)
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