某linux主机上可以看到如下所示的信息：-rwx r-x --- 1 root bin 3853 Aug 10 5：49 javac* 则表明采用此种保护位方案的访问控制模型是（ ）。
正确答案及解析
正确答案
解析
基于列的自主访问控制
1.基于列的自主访问控制基于列的自主访问控制机制是在每个客体上都附加一个可访问它的主体的明细表，它有两种形式，即保护位(protection bits)和访问控制表(Access Control List, ACL)。 (1)保护位。这种方法通过对所有主体、主体组以及客体的拥有者指明一个访问模式集合，通常以比特位来表示访问权限。
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