What is the key difference between Level $3($Behavior$)$ and Level $4($Results$)$ in the Kirkpatrick Model?

Select one:

a$.$ Level $3$ evaluates emotional reactions, whereas Level $4$ evaluates skill acquisition.

b$.$ Level $3$ focuses on observable workplace changes, while Level $4$ measures organizational impact.

c$.$ Level $3$ assesses learning outcomes, while Level $4$ assesses retention rates.

d$.$ Level $3$ measures learner satisfaction, while Level $4$ measures job performance.