Question: Which of these are valid identifiers ( or variable names ) ? Select all those which are valid. Sum sum xyz 1 2 3 XYZ

Which of these are valid identifiers (or variable names)? Select all those which are valid.
Sum
sum
xyz123
XYZ123
123xyz
score!
A2b3c
2a3b4
number_of_games
765
_765
number-of-games

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