Explanation

A Trap door (or backdoor) is a hidden entry point into a system that bypasses normal authentication, making it a serious security threat.

Unlike viruses or worms, it allows unauthorized access without detection, potentially exposing entire systems.

Explanation

Sabotage refers to the intentional destruction or damage of data or systems.

It involves deliberate harmful actions, unlike accidental data loss or hardware failures.

Explanation

Transmission media refers to the physical path (like cables or wireless signals) used to transfer data between devices.

It enables communication in computer networks, such as LANs and the Internet.

Explanation

Java applets are small programs written in Java that run inside a web browser.

They are used for interactive features in web applications (though now largely outdated).

Explanation

A variable is a named memory location whose value can change during the execution of a program.

In contrast, a constant has a fixed value that does not change while the program runs.

Explanation

The UNIX operating system was originally developed in assembly, but later rewritten in C to make it portable.

This marked a major milestone in OS development, allowing UNIX to run on different hardware platforms.

Explanation

The C programming language was developed in 1972 by Dennis Ritchie

in the Bell Laboratories of the AT & T (American Telephone & Telegraph),located in U.S.A.

Dennis Ritchie is known as the founder of c language.

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Co developer of Unix

C is a general-purpose computer programming language.

It was created in the 1970s.

By design, C's features cleanly reflect the capabilities of the targeted CPUs. 

Designed by: Dennis Ritchie

First appeared: 1972

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Explanation

Assembly language is a low-level programming language that is just one step above machine language (binary code).

It uses mnemonics to represent machine instructions, making it easier for humans to read and write compared to raw machine code.

Explanation

The Data Link layer is responsible for physical addressing through MAC (Media Access Control) addresses.

The Physical layer deals with transmitting raw bits over the medium.

Explanation

A computer program is written using a set of codes (instructions) that the computer can understand.

These codes are composed of programming languages made up of symbols, words, and syntax, but collectively called codes.