Explanation:

- Let's evaluate the original expression: \(8 \times 9 \div 15 + 30 - 5\).

- If multiplications and divisions are performed first, it simplifies to: \(72 \div 15 + 30 - 5\).

- This results in: \(4.8 + 30 - 5\).

- Solving further gives: \(29.8\), which isn't 63.

- Option 1: Switching '-' and '×'

- Expression becomes: \(8 - 9 \div 15 + 30 \times 5\).

- This results in: \(-0.6 + 150\), which sums to \(149.4\).

- Option 2: Switching '+' and '-'

- Expression becomes: \(8 \times 9 \div 15 - 30 + 5\).

- This leads to: \(4.8 - 30 + 5 = -20.2\).

- Option 3: Switching '+' and '×'

- Expression becomes: \(8 + 9 \div 15 \times 30 - 5\).

- This results in: \(8 + 18 - 5 = 21\).

- Option 4: Switching '÷' and '-'

- Expression becomes: \(8 \times 9 - 15 + 30 \div 5\).

- Calculation: \(72 - 15 + 6 = 63\).

Correct Answer: Option 4 - '÷' and '-'

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