Which of the Yollowing compiler error occurs when necessary variable identification has not been executed A) Type mismatch B) Unknown identifier C) Invalid file name executed=Identitier expected D) Identifier expected

The correct answer is D) Identifier expected.<br /><br />When a compiler error occurs due to the lack of necessary variable identification, it means that the compiler is expecting an identifier (such as a variable name) but did not find one. This error typically occurs when a programmer forgets to declare or define a variable before using it in the code.<br /><br />In this case, the error message "Identifier expected" indicates that the compiler is expecting an identifier (variable name) at that specific location in the code. This error can be resolved by declaring or defining the variable before using it in the code.<br /><br />The other options provided are not directly related to the lack of variable identification:<br /><br />A) Type mismatch: This error occurs when there is a mismatch between the expected data type and the actual data type of a variable or expression.<br /><br />B) Unknown identifier: This error occurs when the compiler cannot find the definition or declaration of a variable or identifier that is being used in the code.<br /><br />C) Invalid file name: This error occurs when the compiler encounters an invalid or non-existent file name while trying to access or include a file in the code.