Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| distribution | compile time buffer checks | mandatory access control | software executable space protection | grsecurity | rsbac |
| alpine linux | unknown | unknown | pax | yes | unknown |
| debian / ubuntu | yes | selinux , apparmor | pax | optional | optional |
| fedora | yes | selinux | exec shield | no | no |
| gentoo | optional | selinux | pax | optional | optional |
| mandriva | unknown | apparmor | unknown | unknown | yes |
Title:
comparison of linux distributions
Statement:
debian / ubuntu and fedora require compile time buffer checks , on gentoo they are optional
Answer:
supported