Which one of the following is the CORRECT expression for the self-inductance of a solenoid?

• A. L = μ0N2AI
• B. \(L = \frac{{{\mu _0}{N^2}A}}{l}\)
• C. L = μ0NA2l
• D. \(L = \frac{{{\mu _0}{N^2}{A^2}}}{I}\)