Shown below is the graph of the flow rate f(t) of a pipe, in gallons per minute. Here, t = the number of minutes. Using this information, find f(t) dt, which gives the total number of gallons of water that flowed through this pipe in 8 minutes. 5 Gallons/Minute 0 3 6 Minutes X a.) O f(t) at = 25 gallons b.) 8 o f(t) at = 27 gallons C.) 8 O f(t) dt = 29.5 gallons d.) 8 O f(t) at = 26.5 gallons