What is the correct format to denote the beginning of a bash script?

The correct format to denote the beginning of a bash script is to use the shebang line, which specifies the interpreter to be used for executing the script. In this case, the correct format is #!/bin/bash.

This line indicates that the script should be executed using the Bash shell, which is located at the /bin/bash path on many Linux systems. By including this shebang at the very top of the script, you ensure that when the script is run, the operating system knows to invoke Bash to interpret the commands that follow.

While the other options refer to different interpreters, they do not specifically indicate Bash, which is a common requirement if the script contains syntax or features unique to the Bash shell. For instance, #!/usr/bin/bash might be correct on many systems where Bash is located in that path, but it's less standard than #!/bin/bash. The #!/bin/sh shebang refers to the Bourne shell, which lacks many of the extended features that Bash provides. Using #!/bin/zsh indicates that the script should be run using Zsh, which has a different syntax and feature set than Bash.

Hence, for a Bash script, using #!/bin/bash is the appropriate