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:
three of the top linux distributions use pax , only one uses exec shield
Answer:
supported