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.