Answer Happy

Which of the following represents the right hand sum
approximation of area under the curve 𝑦=𝑓(𝑡)? Select one:
a. lim𝑛→∞∑𝑖=0∞𝑓(𝑡𝑖)Δ𝑡
b. lim𝑛→∞∑𝑖=0𝑛−1𝑓(𝑡𝑖)Δ𝑡
c. lim𝑛→∞∑𝑖=1𝑛𝑓(𝑡𝑖)Δ𝑡
d. lim𝑛→∞∑𝑖=1∞𝑓(𝑡𝑖)Δ𝑡