Which one of the following is not a valid identifier?

Which one of the following is not a valid identifier?

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1) Which of the following special symbol allowed in a variable name?

2) An algorithm is best described as:

3) The mapping from assembly language instructions into machine language instruction is:

4) Which one of the following is not a valid identifier?

5) What number would be shown on the screen after the following statements of C are executed?

char ch;
  int i;
  ch = 'G';
  i = ch-'A';
 printf("%d", i);