Multiple choice technology programming languages Command which is used to add variables within a batch file add var var add 1% Reveal answer Fill a bubble to check yourself D Correct answer Explanation In DOS batch files, variables are created using the 'set' command (e.g., 'set var=value'). The notation '%1%' represents the first parameter passed to the batch file. 'add var', 'var', and 'add' are not valid batch commands.