A colony of bacteria has 10,000 bacteria and is growing exponentially. The inequality 10,000(4x) ≥ 320,000 represents the hours, x, for which the colony will have at least 320,000 bacteria.

Which interval represents the hours when the colony will have at least 320,000 bacteria?

[2.5, ∞)
[3, ∞)
[32, ∞)
[0, 2.5]