For the fifth time in 10 years, Advent Corp was selected as the best company of the year

When asked about the secret of their success, the CEO credited it to a small team that spent quality time getting to know their customers and taking responsibility for consumer satisfaction. Their organizational policy also forbade employees to interact with their colleagues socially. Furthermore, their organizational setup was rigidly hierarchical in nature, with lateral communication being a rarity, and employees were expected to fend for themselves after the completion of their training program. How did the company manage to maintain their success?
a) By consistently giving high priority to customer relation
b) By prohibiting romantic relationships in the workplace for an extended stretch of time
c) By including mentoring relationships at every organization level since its inception
d) By managing to satisfy the basic needs of their employees from the date they join

A