(a) Does the command "library(TSA)" install the package TSA? (b) What does the command "win.graph(width=4.875, height=3,point size=8)" do? (c) How do I initialize in R the random number generator? (d) Fill the 4 question marks in the output below with correct R commands or values. Call: ?? (formula = rwalk" time (rwalk)) Residuals: Min 10 Median -2.70045 -0.79782 0.06391 0.63064 2.22128 ?? Max Coefficients: Estimate Std. Error t value Pr>It) (Intercept) -1.007888 ?? -3.391 0.00126 ** time(rwalk) 0.134087 0.008475 ??