If V is a subset of a Euclidean space, then x is an interior point if V if there exists

If V is a subset of a Euclidean space, then x is an interior point if V if there exists ____ ball cantered at x which is completely contained in V.
(a) an exterior
(b) an open
(c) a closed
(d) a hyper

Anurag Mishra Professor Asked on 14th March 2016 in Maths.
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    Answer: (b) an open 

    Anurag Mishra Professor Answered on 4th June 2016.
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