The invalid C variable name among the options is "int $main;". In C, variable names cannot start with a special character like $. They can only start with a letter (either uppercase or lowercase) or an underscore. Therefore, "int $main;" is not a valid C variable name. The other options "float rate;", "int number;", and "int variable_count;" are all valid C variable names.

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The invalid C variable name among the options is "int $main;". In C, variable names cannot start with a special character like $. They can only start with a letter (either uppercase or lowercase) or an underscore. Therefore, "int $main;" is not a valid C variable name. The other options "float rate;", "int number;", and "int variable_count;" are all valid C variable names.

Which of the following is not a valid C variable name?int $main;float rate;int number;int variable_count;

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