C programming এ নিচের কোনটি Invalid variable name?

C programming এ নিচের কোনটি Invalid variable name?

  1. a) Average
  2. b) No#of-students
  3. c) Xyz
  4. d) y23z

From the BPSC Assistant Programmer (ICT) 2020 – Preliminary exam, question 8 of 37.

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