Which of the following components is included in the inside address of a letter?

The inside address of a letter typically includes important information about the recipient that helps identify who the letter is intended for and where it should be sent. This section generally contains the recipient's name, title, company name, and mailing address. Including the recipient's title and company name is essential because it ensures that the letter reaches the right individual within the organization and provides context about their role.

While the other options might be useful in certain situations, they do not usually belong in the inside address of a formal letter. A social security number is sensitive information that is not relevant for addressing correspondence, and an email address or phone number can be included in the contact information or at the end of a letter, but they are not standard components of the inside address. Therefore, having the recipient's title and company name as part of the inside address makes it clear and professional, facilitating appropriate and timely communication.