Among businesses with "Wi-Fi" attribute, which businesses id are located at SC State?
"Wi-Fi" attribute refers to attribute_name = 'Wi-Fi' AND attribute_value = 'true'
SELECT T3.business_id FROM Attributes AS T1 INNER JOIN Business_Attributes AS T2 ON T1.attribute_id = T2.attribute_id INNER JOIN Business AS T3 ON T2.business_id = T3.business_id WHERE T1.attribute_name = 'Wi-Fi' AND T2.attribute_value = 'true' AND T3.state = 'SC'