Final answer:
The bank employees were victims of a watering hole attack, a type of cyber attack where attackers infect a website frequented by the target group with malware, intending to compromise devices of users who visit the site.
Therefore, the correct answer is: option 'A watering hole attack'.
Step-by-step explanation:
The watering hole attack is kind of cyber attack occurs when attackers compromise a specific website known to be frequented by their intended victims.
The attackers then infect that site with malware so that when the targeted users visit the website, their devices become infected. This technique allows hackers to target specific groups without raising immediate suspicion.
Hackers utilize various methods to compromise systems and lure individuals into jeopardizing their security. Clicking on a suspicious link in an email or visiting a compromised website can put personal information at risk.
It's crucial for users to be vigilant about the sites they visit and the links they click, as these actions can result in serious security breaches.