Smishing (SMS phishing) occurs when attackers send fraudulent text messages pretending to be a trusted source, tricking the victim into giving up sensitive credentials. Since this came via text message, it qualifies as smishing.
A). DNS poisoning corrupts name resolution.
B). ARP spoofing manipulates MAC-to-IP mappings.
C). Vishing is phishing via voice calls, not text.
References (CompTIA Network+ N10-009):
Domain: Network Security - Social engineering, phishing types (smishing, vishing, spear phishing).