Which of the following are acceptable module names?

The choice of "main_module" as an acceptable module name is correct because it adheres to the conventions set by Puppet for naming modules. Puppet modules must follow specific rules for naming to ensure that they are valid and can be easily recognized and utilized within Puppet environments.

Module names can include lowercase letters, numbers, and underscores. The use of underscores is particularly common to separate words in a name, making the module's purpose clearer. In this case, "main_module" uses an underscore to effectively delineate "main" and "module," enhancing readability and understanding.

The other options present issues that make them unacceptable. For example, starting a module name with a number (as seen in "14module") violates Puppet's naming conventions. Similarly, while "module14" and "main" are more straightforward, "module14" begins with letters but does not have an underscore to separate the terms, which may lead to confusion about its purpose. "main," while short and simple, does not follow the more descriptive naming style commonly used in Puppet modules, which often prefer more specific and contextual names.

In summary, "main_module" is valid because it meets the syntactical rules and conventions for Puppet module names, making it easily interpretable and compliant