MCQ Practice4. Which of the following could be a valid DOS file specification?Subject: Computer Science EngineeringTopic: Disk Operating System (Dos)ANOSFILE.POSTBNOSFILE.P.OSTCNOSFILE.DOCDNOST.FILEDOCCorrect 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