MCQ PracticeWhile working with MS-DOS which command is used to copy all files with extension .txt into one file named all.txt?Subject: Computer Science EngineeringTopic: Disk Operating System (Dos)ACopy a: *.txtBCopy *.txt a:CCopy *.txt c:DCopy *.txt all.txtCorrect Answer: DPractice QuizBack to MCQsRelated MCQsCurrent flows in a circuit whenEighttenths coulomb passes a point in 4 s. The current in amperes isThe unit of electrical charge is the