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

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

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

2) A C variable cannot start with

3) What will be printed after execution of the following program code?

main()
 {
       printf("\\nab");
        printf("\\bsi");
        printf("\\rha");
  }

4) The ____________ symbol is used to indicate the starting and stopping in the flowchart.

5) Algorithm if written in computers language, then such set of instructions is called a _______________.