Which statement about the contribution made by Jack Welch toward management thought and practices is true?

Multiple Choice

$He$ is known for being the first person to discuss "management by objective" $($MBO$),$ by which a manager should be self$-$driven to accomplish key goals that link to organizational success.

He established the need for organizations to set clear objectives and establish the means of evaluating progress toward those objectives.

He contends that bureaucratic structures can eliminate the variability that results when managers in the same organization have different skills, experiences, and goals.

He advocated the application of scientific methods to analyze work and to determine how to complete production tasks efficiently.

He is widely viewed as having mastered "all of the critical aspects of leadership: people, process, strategy and structure."