Gavin is the supervisor of the payroll department at a manufacturing firm. his job entails supervising the work of several payroll​ clerks, training them in proper​ procedures, and ensuring that they are withholding taxes and other payroll deductions in accordance with the law and company policy. gavin would best be described as​ a(n) _______ manager.
a. executive
b. ​first-line
c. top
d. ​non-supervisory
e. middle