Objective-C: Undefined symbol for architecture arm64: _myMethod

Question

What is the conventional way to declare a private method?

Accepted Answer

You have to implement it in the .m and add a class extension in the .m with the declaration of it.

Answer

You have to implement it in the .m without declaring it in the .h

Answer

You have to implement it in the .m and declare it in the .h

Answer

It is not possible in Objective-C.

Question from the Objective-C test