Which one is the oldest and most used shell
B
Correct answer
Explanation
The Bourne shell (sh) is the oldest Unix shell, developed by Stephen Bourne at AT&T Bell Labs in 1977. It served as the foundation for many subsequent shells including Bash (Bourne Again Shell) and Korn shell. While Bash is very popular today, Bourne shell's historical significance and widespread adoption make it the correct answer for 'oldest and most used'.