Which of the following is the main function of a bootstrap loader? (A) Manage hardware resources (B) Load and execute the operating system kernel (C) Provide a graphical user interface (D) Handle user authentication (E) Manage network connections

The main function of a bootstrap loader is (B) Load and execute the operating system kernel.

Here's a step-by-step explanation:

1. When you turn on your computer, the first program that the microprocessor runs is a set of instructions stored in the computer's read-only memory (ROM). This code examines the system hardware to make sure everything is functioning properly. This power-on self-test (POST) includes a check of the BIOS.

2. The BIOS is a program pre-installed on Windows-based computers (not on Macs) that the computer uses to start up. The CPU accesses the BIOS even before the operating system is loaded.

3. The BIOS then checks the sequence of the storage devices identified as boot devices in the BIOS setup.

4. Once it finds a bootable device, the BIOS hands over control to the bootstrap loader.

5. The bootstrap loader is a small program that has a single function: it loads the operating system into memory and allows it to begin operation. In other words, it loads and executes the operating system kernel.

So, the main function of a bootstrap loader is to load and execute the operating system kernel.