Please choose the correct ending to complete the given sentence: Work World: [header] How to write nursing credentials [title] Separate the nurse's name and each credential with a comma. [step] A comma should immediately follow the nurse's name, with commas separating each credential. Do not use periods in the acronyms.

Ending1: For instance, you would write rn, not r.n. [title] Start by listing the highest degree earned. Ending2: [substeps] " rn: first person care " and " tech " are the most common form of an acronym used in nursing. " nurse " comes across as informal and like two letters. Ending3: When you write each credential, write it in italics in the following order: | m + c. a + c b | a] m | e | b. Ending4: Note: the abbreviation mnor thysine is not needed, or in some cases, other types of acronyms. To start, left-hand numbering equals unnecessary periods and aside from the nurse's name, only listed in parenthesis would be neater.

Answer format: ending1/ending2/ending3/ending4