An advertising company plans to air seven advertisements—B, C, D, F, H, J, and K—in seven consecutive time slots, numbered 1 through 7. Each advertisement is assigned to exactly one time slot. The advertisements must be scheduled according to the following conditions:

• B must be aired before D.
• H must be aired immediately after B.
• D must be aired before F.
• F must be aired before J.
• H must be aired before C.
• C must be aired before K.

Question:

If advertisement B is assigned to the first time slot, then which of the following must be true?