Python
Which of the following is invalid variable in Python?

_a = 1
__str__ = 1
__a = 1
None of the mentioned

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Python
Which of the following statements is true?

A subclass method can be overridden by the superclass
A non-private method in a superclass can be overridden
A private method in a superclass can be overridden
Overriding isn’t possible in Python

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