Seven students - Ferdous, Juthi, Keya, Masum, Rabeya, Salim, and Tamara - are eligible to enter a debating competition. From these seven, IBA Debating Club must form two teams, a red team and a green team, each team consisting of exactly three of the students. No student can be selected for more than one team. Team selection is subject to the following restrictions: If Masum is on the red team, Keya must be selected for the green team. If Ferdous is on the red team, Rabeya, if selected, must be on the green team. Rabeya cannot be on the same team as Salim. Juthi cannot be on the same team as Keya. If Masum is on the red team, which of the following, if selected, must also be on the red team?