Which statement is true regarding class and variable naming conventions?

The statement that class names can start with an underscore while variables can is not accurate in regards to standard naming conventions in Puppet. Puppet class names traditionally follow specific conventions to ensure usability and compatibility within the Puppet ecosystem, which includes not starting with special characters such as underscores.

In Puppet, class names are typically capitalized and can contain letters, numbers, and underscores, but they must start with a letter. On the other hand, variables follow a different set of rules. Variables can indeed begin with an underscore and generally can include both letters and numbers as well.

The distinction in naming conventions comes down to ensuring that classes can be easily referenced and managed within Puppet manifests, whereas variables tend to have more flexibility for expression within the code during runtime. Understanding these conventions is crucial for effective Puppet programming and maintaining clean, readable code.