Which software layer is primarily responsible for resource management and program execution in a computer system?

Which software layer is primarily responsible for resource management and program execution in a computer system?

• A. Bootloader
• B. Hypervisor
• C. Operating System
• D. System BIOS

Answer: (C)

The operating system is responsible for organizing how resources like CPU time, memory, and I/O are allocated and how programs actually run. It includes the kernel’s scheduler to determine which process runs when, and it performs context switches to switch between processes. It also handles memory management—allocating memory to processes, managing virtual memory, and protecting process memory from each other—so programs can execute safely. In addition, the OS provides device drivers and system services that let applications interact with hardware without needing to manage those details directly. The bootloader’s job is to start the system by loading the operating system into memory and handing control over to it during startup, not ongoing resource management. The BIOS (firmware) runs earlier to initialize hardware and perform power-on self-test. The hypervisor manages resources in a virtualized environment by distributing hardware among virtual machines, which is a specialized role beyond standard resource management for a single operating system.

The operating system is responsible for organizing how resources like CPU time, memory, and I/O are allocated and how programs actually run. It includes the kernel’s scheduler to determine which process runs when, and it performs context switches to switch between processes. It also handles memory management—allocating memory to processes, managing virtual memory, and protecting process memory from each other—so programs can execute safely. In addition, the OS provides device drivers and system services that let applications interact with hardware without needing to manage those details directly.

The bootloader’s job is to start the system by loading the operating system into memory and handing control over to it during startup, not ongoing resource management. The BIOS (firmware) runs earlier to initialize hardware and perform power-on self-test. The hypervisor manages resources in a virtualized environment by distributing hardware among virtual machines, which is a specialized role beyond standard resource management for a single operating system.