A software company conducted an internal performance evaluation survey among its 150 employees. The survey asked employees to rate their job satisfaction on a scale from 1 to 5, where 1 means 'very dissatisfied' and 5 means 'very satisfied'. The results of the survey were aggregated as follows:
- 1 (Very Dissatisfied): 10 employees
- 2 (Dissatisfied): 20 employees
- 3 (Neutral): 50 employees
- 4 (Satisfied): 40 employees
- 5 (Very Satisfied): 30 employees
Based on this data, what is the mode of the job satisfaction ratings?