Select all representations for the domain of a function given by time passed since your last meal.

Responses

{x| x>0}
{x| x>0}

(0, ∞)
(0, ∞)

{x| x∈R}
{x| x∈R}

(−∞, ∞)
(−∞, ∞)

{x| x≥0}
{x| x≥0}

[0, ∞)