1. Computer Science and Engineering Department, Thapar Institute of Engineering and Technology, Patiala 147004 India (e-mail: mamta@thapar.edu).
2. Department of Computer Engineering, National Institute of Technology, Kurukshetra, Haryana 136119 India, with the Department of Computer Science and Information Engineering, Asia University, Taichung, 413 Taiwan, with King Abdulaziz University, Jeddah 21589, Saudi Arabia, and also with the Staffordshire University, ST4 2DE, Stoke-on-Trent, U.K. (e-mail: gupta.brij@gmail.com).
3. American College of Greece 20006, Athens Greece, and also with the King Abdulaziz University, Jeddah 21589 Saudi Arabia (e-mail: mlytras@acg.edu).