Which of the following is not one of the SSA's verification methods available to employers for verifying Social Security Numbers?

One of the methods that the Social Security Administration (SSA) offers for verifying Social Security Numbers (SSNs) is through a paper list. This approach allows employers to submit a list of names and SSNs for verification, which the SSA will then process and return the information regarding the validity of those SSNs.

Phone verification is also a method used by the SSA, giving employers the opportunity to check SSNs by speaking directly with an SSA representative. Although faxing is not standard for this verification process, it is important to note that the SSA has specific systems in place that don't typically accept fax as a reliable or acceptable method for SSN verification.

Magnetic tape is a legacy method that historically allowed bulk data submissions but is largely outdated. This means that it is not a common or contemporary option available to employers today for SSN verification.

Thus, the verification method that does not align with the current options provided by the SSA is fax, which does not fall under the standard procedures employers are encouraged to use for checking SSN accuracy.