Cray-1, जिसे दुनिया का पहला व्यावसायिक रूप से सफल सुपरकंप्यूटर माना जाता है, किस वर्ष जारी किया गया था?

Which of the following is NOT a valid model or series of the PARAM supercomputer developed by C-DAC, India?

At the time of its commissioning in India, where did the supercomputer 'Pratyush' rank globally among dedicated weather HPC systems?