Which natural numbers satisfy the condition?

a) [[$ x < 4 $]]

Answer: Numbers , , , .

b) [[$ 0 ≤ x ≤ 3 $]]

Answer: Numbers , , , .

c) [[$ -3 < x < 5 $]]

Answer: Numbers , , , , .

d) [[$ 155 ≤ x < 142 $]]

Answer: .