Answer
Rhenium has the lower EN, therefore electrons will SHIFT AWAY from it towards Selenium, the more electronegative element. Therefore, rhenium will be oxidized and selenium wlll be reduced.
Work Step by Step
Rhenium has the lower EN, therefore electrons will SHIFT AWAY from it towards Selenium, the more electronegative element. Therefore, rhenium will be oxidized and selenium wlll be reduced.