कंप्यूटर को वार्म बूट (warm booting) करने के लिए निम्नलिखित में से किस शॉर्टकट कुंजी संयोजन का उपयोग किया जाता है?

Which service of an operating system manages the allocation of hardware resources such as main memory, CPU cycles, and file storage to different users or tasks in a multi-user environment?

Identify the operating system from the following options that is primarily designed for mobile devices rather than standard desktop computers or laptops.