PPSC Past Paper CARETAKER Lahore High Court 2019 Solved MCQs, Computer MCQs, PPSC Solved Past Papers MCQs______ is not a multitasking operating system? Posted on April 30, 2021 by Rana TahirA. Windows Xp B. Unix C. DOS D. LinuxShare this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)