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Which one of the following tools may be used to achieve the goal of nonrepudiation?

A. Digital signature B. Symmetric encryption C. Firewall D. IDS

To sum the rows and columns of a two-dimensional array:

a. The rows are summed, then the columns, and finally the grand total. b. The columns are summed, then the rows, and finally the grand total. c. The rows and columns are summed together. d. The rows and columns are summed in the same inner loop with the results placed in an added row and an added column. The grand total is summed in the outer loop.