Description: MNT_RDONLY is a mount option used in operating systems to specify that a filesystem should be mounted in read-only mode. This means that once mounted, modifications to the content of the filesystem will not be allowed, including the creation, deletion, or modification of files and directories. This option is crucial for ensuring data integrity, especially in situations where access to data is required without the risk of alteration. By mounting a filesystem as read-only, information is protected from accidental or malicious damage, which is particularly useful in production environments or in systems handling critical data. Additionally, MNT_RDONLY can be used in data recovery situations, where access to a damaged filesystem is needed without risking overwriting valuable information. In summary, MNT_RDONLY is an essential tool for the safe management of filesystems in Unix-like systems, providing an additional layer of protection for stored data.