विंडोज सिस्टम में, _______ विंडो वह स्थान है जहाँ आप अपने डेस्कटॉप के रूप और स्वरूप (look and feel) को बदल सकते हैं।

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.