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A) numbers = 1,000,000

B) numbers = 1000 2000 3000

C) numbers = 1000, 2000, 3000

D) numbers = 1,000,000

Answer: B) numbers = 1000 2000 3000

Whitespace is not allowed in a variable names. If we write number one as a variable name it will be an invalid while using an _ character between two words makes it a valid variable name. for example number_one is a valid variable name.

Reference

Variable Names and Naming Rules