Suppose that from $1980$ until $2000,$ the rate at which a certain redwood tree grew was constant. Let$$h$($t$)$ represent the height of the redwood in feet t years after $1980.$ Which function could realistically represent$$h$($t$)$ from $1980$ to $2000?$

$$h$($t$)=50$

$$h$($t$)=50+12$t$21$t$$

$$h$($t$)=1980+12$t$21$t$$

h$($t$)=50(32)$t$(23)$t

None of these