I suggest you send it in 03 format, because many companies are used to using the 03 version of word, and you may not be able to open the 07 version, because the high version can open the low version, and the low version cannot open the high version. It's okay if you send a PDF, but generally speaking, PDF sends some important documents, because it's not easy to modify PDF, and you think it's a bit inappropriate to send it in this format. Also, I suggest you send a picture format, because the picture format is the safest. If you send a document, you should consider that the receiver must install some kind of software, and the picture format does not need to be considered. There is nothing wrong with the picture format. This error means that if you send a typesetting document, if there is something wrong with the recipient's software, it may disturb your format. In this case, the picture format is the safest.