The correct answer is A zip file can contain both pdf and doc files.ZIP is an archive file format that supports lossless data compression. A ZIP file may contain one or more files or directories that may have been compressed.The ZIP file format permits a number of compression algorithms, though DEFLATE is the most common.This format was originally created in 1989 and was first implemented in PKWARE, Inc.'s PKZIP utility, as a replacement for the previous ARC compression format by Thom Henderson. A zip file can contain both pdf and doc files.Additional Information Not only do folders hold files, but they also can hold other folders.A folder within a folder is usually called a subfolder.You can create any number of subfolders, and each can hold any number of files and additional subfolders.A file can not contain another file just like a folder can contain another folder. Hence option 2 is false.A folder can be compressed as a zip file.A folder can have both zip and pdf files. Hence option 3 and option 4 are false.