In the context of organizational structure, what does "line authority" primarily represent?

In the context of organizational structure, what does "line authority" primarily represent?

The direct chain of command and ability to give orders from top$-$level management to frontline employees.

The power held by top$-$level executives in decision$-$making processes.

The authority granted to staff departments for specialized tasks.

The influence exerted by external stakeholders on organizational decisions.