单选题 A characteristic of operating system is _________. 的答案

成人教育远程网络教育函授网上考试【计算机专业英语】课程在线考试模拟试题正确答案解析，免费查看【计算机专业英语】作业答案。
题目内容：
A characteristic of operating system is _________.
题目选项

all the above

memory management