Identify an acceptable variable name in Puppet.

In Puppet, variable names must follow specific rules to be considered valid. The most important rule is that a variable name must start with a letter or an underscore. After the initial character, variable names can include letters, numbers, underscores, and dashes.

The option representing a valid variable name is structured correctly, starting with a letter followed by additional characters that are permissible. This allows for clear and meaningful identifiers that can be easily referenced throughout the Puppet manifest.

In this particular scenario, the choice with the format starting with a letter followed by other valid characters meets all defined criteria for a Puppet variable. This is essential to ensure that the variable can be properly recognized and utilized in the configurations and scripts being written in Puppet.

Other choices break one of these fundamental rules. For instance, a variable name cannot start with a number, nor can it contain special characters like dashes, which are not allowed in variable names due to naming conventions in programming. Hence, the importance of adhering to these conventions is reflected in the acceptability of the variable name in Puppet, highlighting why the chosen answer is indeed valid.