Which languages are used for making an operating system

Question

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Answer 1

C, C++
first operating systems like Unix were written in C. Linux kernel is written in C++. and window operating system are also written in C++.
Source : Just google it.

Answer 2

Some Bash could be used.

Answer 3

C, C++ or any low level language as they provide direct access to hardwares and drivers.

Answer 4

Assembler

Answer 5

Mostly c and c++