C-18-Q090mediumsingle_mcq

Which of the following is a valid Python variable name?

a9810
b$variable
cprint
dNational_ID

ব্যাখ্যা

A valid Python identifier must start with a letter or underscore and contain only letters, digits, and underscores, so National_ID qualifies. The others fail: 9810 starts with a digit, $variable uses an illegal symbol, and print is a built-in name.

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