Final answer:
In a Dial By Name Directory, extensions can be omitted C. in the employee’s middle name and job title as they do not usually have associated extensions, unlike first and last names that require exact spelling for proper identification.
Step-by-step explanation:
In a Dial By Name Directory, you are allowed to omit an extension in two specific places. These are in the employee's middle name and in the employee's job title. Extensions are typically required for the first and last names to help in accurately identifying the individual within an organization's directory system. It is important to ensure the correct spelling of the first and last names to match the extension assigned to that particular employee. Job titles and middle names do not usually have associated extensions, hence, they could be omitted when navigating a Dial By Name Directory.
If a company has a Dial By Name Directory, callers can search for an employee by either their first name or last name. For example, if a caller is trying to reach John Smith and doesn't know his extension, they can dial the corresponding numeric buttons that match the letters in his name (i.e., 5-6-4-6-8-4). They do not need to enter an extension.
Omitting an extension in the employee's middle name or job title would not make sense, as those fields are not typically used in a Dial By Name Directory.