In modern enterprise management, effective communication is considered a key factor in enhancing the quality of employee feedback. Which of the following best reflects the positive impact of effective communication on management?

A、Effective communication can reduce employee work stress and enhance team morale and cooperation.
B、Effective communication is irrelevant as long as managers can set clear goals and tasks.
C、Effective communication leads to information overload, making employees feel confused.
D、Effective communication is only important for senior managers; ordinary employees do not need to pay attention to it.