Which of the following has no solution?
a.(x + 1 < -1) ∩ (x + 1 < 1)
b.(x + 1 ≤ 1) ∩ (x + 1 ≥ 1)
c.(x + 1 < 1) ∩ (x + 1 > 1)
a.(x + 1 < -1) ∩ (x + 1 < 1)
b.(x + 1 ≤ 1) ∩ (x + 1 ≥ 1)
c.(x + 1 < 1) ∩ (x + 1 > 1)