With no explanation, label text_A→text_B with either "NOT ENOUGH INFO", "REFUTES" or "SUPPORTS".
text_A: Serbia was one of the earliest Slavic political formations in the Early Middle Ages .
text_B: The first attested Slavic polities were Serbia and Great Moravia , the latter of which emerged under the aegis of the Frankish Empire in the early 9th century .
SUPPORTS.