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Which of the following class allows to declare only one object of it?

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Which of the following class allows to declare only one object of it?

(a) Abstract class

(b) Virtual class

(c) Singleton class

(d) Friend class
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Right option is (c) Singleton class

Explanation: Singleton class allows the programmer to declare only one object of it, If one tries to declare more than one object the program results into error.
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