Because system administrators have the option to use either…

Because system administrators have the option to use either the absolute mode or symbolic mode to provide permissions settings, it is crucial for new administrators to understand both modes. What would the corresponding absolute mode value be for permissions expressed as u=rw,g=r,o=r in symbolic mode?

A teacher notices that a student frequently talks out of tur…

A teacher notices that a student frequently talks out of turn during class discussions. The teacher begins praising the student each time he raises his hand and waits to be called on, and stops responding when he talks out. Over time, talking out decreases. Differential reinforcement most likely worked because: