Which of the following statements about motivation theories is not true
a. Herzberg’s two-factor theory, job-context factors such as salary and working condition determine employee’s level of motivation
b. Adam’s equity theory, employees’ motivation depends on both their own beliefs and their perceptions of what happens to others
c. Maslow’s needs hierarchy theory, lower-level needs must be satisfied before higher-level needs become motivators
d. Locke’s goal setting theory, saying “do your best” to employees is not the best way to motivate them