Can you answer this numerical problem ASAP please?

Problem: Your friend did an experiment applying loads to samples of high-performance concrete and measuring the resulting strains. They made a data set, with the loads in a vector X and the strains in a vector y. Their advisor said to plot the data "using a polynomial" but they do not know what that means. In particular, they are confused about what degree of polynomial to use and whether or not it should go through the data points. a. Explain to them what polynomial interpolation is and how to get it in Matlab. Illustrate with a sketch. b. Explain to them what polynomial least squares approximation is and how to get it in Matlab. Illustrate with a sketch c. Explain to them which of these two methods is better for their data set and why