CREATE TABLE table_74399 ("Date" TEXT, "Time" TEXT, "ACC Team" TEXT, "Big Ten Team" TEXT, "Location" TEXT, "Television" TEXT, "Attendance" FLOAT, "Winner" TEXT, "Challenge Leader" TEXT)

How many challenge leaders were there of the games won by virginia (87-79)?
SELECT COUNT("Challenge Leader") FROM table_74399 WHERE "Winner" = 'Virginia (87-79)'
SELECT COUNT("Challenge Leader") FROM "table_74399" WHERE "Winner" = 'Virginia (87-79)'