Anne, the Chief Executive Officer (CEO), has reported that she is getting multiple telephone calls from someone claiming to be from the helpdesk. The caller is asking to verify her network…

Vishing (voice phishing) is a social engineering attack that uses telephone calls to trick individuals into divulging sensitive information, such as network authentication credentials. The described scenario explicitly states the CEO is receiving 'multiple telephone calls' from someone 'claiming to be from the helpdesk' asking to 'verify her network authentication credentials', perfectly aligning with the definition and characteristics of a vishing attack.

Impersonation is a broader social engineering technique where an attacker pretends to be someone else, but vishing is the specific term for impersonation conducted over voice communication to solicit information.

Spim (spam over Internet Messaging) refers to unsolicited messages sent via instant messaging platforms, which is not relevant to telephone calls.

Scareware is malicious software that uses deceptive pop-ups and alarming messages to trick users into purchasing fake software or services, which is distinct from a phone call requesting credentials.