(Solved): (6 points) Determine how many pivots each of the following matrices have. 1. [0010019 ...

(6 points) Determine how many pivots each of the following matrices have. 1. $\left[\begin{array}{llll}0& 1& 0& ?9\\ 0& 0& 1& ?3\end{array}\right]$ A. One Pivot B. Two Pivots C. Three Pivots D. Four Pivots 2. $?\begin{array}{ccc}1& 0& ?8\\ 0& 0& 0\\ 0& 0& 0\end{array}?$ A. One Pivot B. Two Pivots C. Three Pivots D. Four Pivots 3. $?\begin{array}{llll}1& 0& 6& 5\\ 0& 1& 4& 8\\ 0& 0& 0& 0\\ 0& 0& 0& 0\end{array}?$ A. One Pivot B. Two Pivots C. Three Pivots D. Four Pivots 4. $?\begin{array}{ccccc}1& 0& 0& 0& 5\\ 0& 1& 0& 0& 9\\ 0& 0& 1& 0& ?3\\ 0& 0& 0& 1& ?8\end{array}?$ A. One Pivot B. Two Pivots C. Three Pivots D. Four Pivots