Which of the following statements is/are correct?
(A). A closed set either contains an interval or else is nowhere dense.
(B). The derived set of a set is closed.
(C). The union of a arbitrary family of closed sets is closed.
(D). The set R of real numbers is open as well as closed.
Choose the correct answer from the options given below:
1
(A), (B) and (D) only.
2
(A), (B) and (C) only.
3
(A), (C) and (D) only.
4
(B), (C) and (D) only.
5
Question Not Attempted