Explanation:

PARAM 8000 was India's first indigenous supercomputer, developed by the Centre for Development of Advanced Computing (C-DAC) in 1991. This marked a significant achievement for India in high-performance computing, demonstrating its capability to build supercomputers after being denied access to foreign technology. Options (b) Aryabhatt was India's first satellite. Options (c) Buddha and (d) Ram are not associated with Indian supercomputer development. Therefore, PARAM 8000 ($ \text{a} $) is the correct answer.