10. Which of the following compiler error occurs when same variable has been identified in 2 different types? (A) Duplicate identifier B) Variable identifier expected C) Type mismatch D) Invalid file type

The correct answer is (A) Duplicate identifier.<br /><br />When the same variable has been identified in two different types, it results in a compiler error known as identifier." This error occurs when the compiler encounters two or more identical variable names within the same scope, leading to confusion about which variable should be used. This is because variables must have unique names within a given scope to avoid ambiguity and ensure proper functioning of the code.