Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to use roman numerals [title] Understand the concept of roman numerals. [step] Roman numerals use fewer symbols than the number system you are used to. I is the number 1 (one), v is 5 (five), and x is 10 (ten), for example.

Ending1: Some great programs like manifesto are already crafted using roman numerals. Roman numerals don't need to be simplified so if you don't know what you're doing, it's going to be difficult to communicate with them. Ending2: Counting starts out as easy as i (one), ii (two), iii (three). But for the next one, write iv for " one away from five " (i away from v), which is four. Ending3: All of these numbers are conjugated by roman digits. Be aware of the meaning behind each digit. Ending4: Make sure to follow these rules before using any mathematical method : [substeps] X = = 1 (2). You don't know the number 1 without very many fractions.

Answer format: ending1/ending2/ending3/ending4