Which of the following pairs of acronyms and their expansion is incorrectly matched?

SMTP actually stands for Simple Mail Transfer Protocol, so pairing it with Simple Mail Transfer Plan is the wrong match.

SMTP is the standard protocol that sends and routes outgoing email between mail servers.

SIM correctly expands to Subscriber Identity Module, the chip that identifies a mobile subscriber.

SQL correctly expands to Structured Query Language, used to manage relational databases.

URL correctly expands to Uniform Resource Locator, the web address of a resource.

The final word in SMTP is Protocol, matching the naming pattern of other network protocols.