Your application has a value type called username that needs to be able to accept null values, but this is generating compile-time errors. How would you fix this in code?

Here is the answer of the question: Your application has a value type called username that needs to be able to accept null values, but this is generating compile-time errors. How would you fix this in code?

• Null username = null;
• string? username = null;
• Type? username = null;
• Optional username = null;

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