Final answer:
Depending on the formality and purpose of the message, when communicating in writing to people in your organization, a business letter, a memo, or a package could be used, so the answer is all of the above.
Step-by-step explanation:
When communicating in writing to people in your organization, the form of communication should be chosen based on the formality and purpose of the message you want to convey. A letter is appropriate for formal communication and is often used when you need to conduct formal correspondence, such as voicing concerns to a congressman or asking a company for a refund for a faulty product. Moreover, when you want to inquire about a job opening, sending a business letter could lead to a favorable response. A memo is more appropriate for internal communications that are less formal and typically shorter than letters. A package is usually sent when physical items need to be passed along with or without accompanying documents. Therefore, the correct answer is d. all of the above, as each method of communication serves a different purpose within organizational correspondence.