This is a classic example of social engineering, where an attacker manipulates individuals into giving up confidential information, such as credentials, by pretending to be someone trustworthy (like help desk staff).
B: Tailgating involves physical access without authentication.
C: Shoulder surfing is spying over someone's shoulder to steal info.
D: Smishing is phishing via SMS.
E: Evil twin involves a rogue Wi-Fi access point impersonating a legitimate one.
# Reference:
CompTIA Network+ N10-009 Official Objectives: 4.2 - Identify common security threats and vulnerabilities.