Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to comment in php [title] Use single-line comments for short comments. [step] If you need to leave a short comment, you can use the single-line comment code. The comment will only last to the end of the line or the end of the code block.

Ending1: [substeps] For example, you may choose to write " five rednecks a day, " where the " ten rednecks a day " code goes. In this case, the single-line comment code goes. Ending2: These comments only work within php tags, and will be read if placed in html. [title] Use multi-line comments for longer comments or code testing. Ending3: Instead of writing " [php] ", you should always address the meaning of the subject line. [substeps] If, for example, you want to write " files accessed recently in our history " you may use the single-line comment code instead of " [php] ". Ending4: [title] Type a comma when you want to leave a comment. [step] This will allow you to quickly type away the comment without missing it.

Answer format: ending1/ending2/ending3/ending4