$($digital technology and democracy$)$ lecture touched upon the Snowden leaks and their implications for cybersecurity. What was a key takeaway from this discussion?

A$.$ Human factors are often the weakest link in security systems, as highlighted by the Snowden case.

B$.$ The Snowden leaks had little impact on the public's perception of cybersecurity.

C$.$ Such leaks demonstrate the robustness of current security systems.

D$.$ Leaks like Snowden's are rare and not a significant concern.