MCQ PracticeWhich of the following is not a valid command?Subject: Computer Science EngineeringTopic: UnixA: .,$w file002B:w 1,$ file002C: .w file002D: $w file002Correct Answer: BPractice 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