Which of Statements A), B) or C) Is False

Which of statements a) , b) or c) is false?

A) A variable name, such as x, is an identifier.
B) Each identifier may consist of letters, digits and xe "underscore character (_) "underscores (_) but may not begin with a digit.
C) Python is xe "case sensitive"case insensitive, so number and Number are the same identifier despite the fact that one begins with a xe "lowercase letter"lowercase letter and the other begins with an xe "uppercase letter"uppercase letter.
D) All of the above statements are true.