Which of the following computer language is written in binary code only?

Correct option is B

Machine Language is the only language that is written in binary code, which consists of 0s and 1s. It is the most basic form of computer language that can be directly understood by a computer's CPU. All other programming languages need to be translated into machine language for the CPU to execute them.
Important Key Points:
1. Machine Language - Written in binary and directly executed by the CPU. It is specific to each type of computer architecture.
2. Binary Code - Represented in sequences of 0s and 1s, making it the lowest-level programming language. It is difficult for humans to write and understand.
Knowledge Booster:
• PASCAL: A high-level programming language that is easy to understand and used primarily for teaching programming concepts. It is not written in binary code.
• C: A general-purpose, high-level language that needs to be compiled into machine code for execution by the CPU. It is not directly written in binary.
• C#: A modern, object-oriented language developed by Microsoft. Like C, it requires compilation before execution and is not written in binary code.