Which statements regarding subvolumes in a BtrFS filesystem are true (Choose two)

Subvolumes in BtrFS are like virtual filesystems that can be mounted separately with the -o subvol= option. They can also have different attributes and quotas. Subvolumes do not have to start with “@” character, although some default subvolumes use this convention. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-btrfs.html#sec-btrfs-subvolumes