Which one describes a pure virtual function in C++?

Which one describes a pure virtual function in C++?

  1. a) virtual void f() = 0;
  2. b) virtual void f();
  3. c) void f()=0;
  4. d) pure virtual f ();

From the BCS Technical Cadre (ICT) October 2025 – 49th BCS Written (Special) (BPSC) exam, question 92 of 106.

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