单选题cron后台常驻程序（daemon）用于（）。A负责文件在网络中的共享B管理打印子系统Manages the printing subsystemC跟踪管理系统信息和错误D管理系统日常任务的调度（scheduling）
单选题
cron后台常驻程序（daemon）用于（）。
A
负责文件在网络中的共享
B
管理打印子系统Manages the printing subsystem
C
跟踪管理系统信息和错误
D
管理系统日常任务的调度（scheduling）
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