Computer Science

The font size tool in many word processing software can be accessed quickly using the shortcut Ctrl + Shift + P, which opens the font size dialog box. The other options do not correspond to font size adjustment shortcuts.

The '@' symbol is used in email addresses to separate the local part (username) from the domain part, effectively dividing the email into two parts.

PB is the abbreviation for Petabyte, a unit of digital information storage. 'Plumber' is unrelated to this abbreviation in computer science context, so option A is correct.

LED stands for Light Emitting Diode, which is a semiconductor device that emits light when an electric current passes through it. This is the widely accepted and correct expansion of the acronym LED.

CSS stands for Cascading Style Sheets, which is the correct and widely accepted full form used in web development for styling web pages.

CU stands for Control Unit, which is a key component of a computer's CPU responsible for directing operations within the processor.

Cache memory is a small, fast memory located inside or very close to the CPU to speed up access to frequently used data and instructions, improving overall processing speed.

CPU stands for Central Processing Unit, which is the primary component of a computer that performs most of the processing inside a computer.

HTML (HyperText Markup Language) is used to create and structure webpages, which are the individual documents displayed in web browsers. Websites are collections of webpages, so HTML directly creates webpages.

CRT stands for Cathode Ray Tube, which is a technology used in older types of computer monitors and televisions. Therefore, CRT is a form of monitor.