Please help solve the following questions Consider the following vectors. Which of the following is true for s$=$axb? A s$-$a$1$b$1+$ a$2$b$2+$ a$3$b$3$ B s$=($a$1+$ a$2+$ a$3)*($b$1+$ b$2+$ b$3)$ Cs$=[$a$1*($b$1+$ b$2+$ b$3)$; a$2*($b$1+$ b$2+$ b$3)$; a$3*($b$1+$ b$2+$ b$3)]$ D None of the above SUBMIT Multiple Choice Which one of the following statements is correct regarding partial pivoting in Gaussian elimination? If a zero$-$ valued pivot is encountered... A Swap the pivot row with the row directly below it B Swap the pivot with a non$-$zero value in the same column C Swap the pivot with a non$-$zero value in the same row D None of the above