When writing a friendly letter, when should the writer use their first and last name when closing the letter?

Plz halp. which statements are true about theme? check all that apply. 1.) themes are observations about life. 2.) themes can be stated in a sentence. 3.) themes and topics are the same thing. 4.) themes are messages a text conveys about a topic. 5.) examples of themes include loyalty, corruption, and greed. 6.)themes are rarely stated directly and need to be inferred by the reader.