What is the correct end of sentence very 1st and following citations for a source with 3 or more authors? Example:

Allen, K., Allen, D., Segers, A., & Dolce, S. (2014). Emotional intelligence and the perceived quality of employee feedback in the workplace.
United Journal of Industrial and Organizational Psychology, 1(3), 22-67.
a. (Allen et al., 2014)
b. Allen, K., Allen, D., Segers, A., & Dolce, S. (2014)
c. (Allen, Allen, Segers, & Dolce, 2014). (Allen, et al., 2014)
d. (Allen, Allen, Segers, & Dolce, 2014).