ch command will return the corner elements O a 10-by-10 matrix A? A. A( [1,end], [1, end]) B. A( [1,1], [end, end]) C. A([1,1], [1,end], [end,1], lend,end]) D. A(1:end, 1:end) Which command will return the fraction of positive numbers in a 10-by-10 matrix A? A. A(A > 0)/A B. numel (A > 0)umel(A) C. sum(A > 0)/prod(size(A)) D. nnz (A > 0)umel (A) Which command will delete (completely remove) the last cell of a cell-array C? A. Ctend)[ B. C[end]- C. C(end) D. C{end} = {[]); Which command will create a plot of acceleration vs. time (i.e., a vector time on the x-axis and a vector acceleration on the y-axis)? A. plot (time, acceleration) B. plot(acceleration, time) C. plot([time, acceleration]) D. plot( [acceleratinn tim