Which one of these is not one of the four sources in the four-source hypothesis?

Name: Which one of these is not one of the four sources in the four-source hypothesis?
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The four-source hypothesis, related to the synoptic problem in biblical studies, proposes four sources for the Gospels of Matthew, Mark, and Luke: Mark, Q (Quelle, meaning "source" in German), M (material unique to Matthew), and L (material unique to Luke). T is not one of these sources.

Which One of These Is Not One of the Four