What is wrong with the following nested for loop?

for (int i = 0; i < 3; i++)
{
    for (int i = 0; i <= 5; i++)
    {
        // body of the loop here
    }
}

• The nested for loop uses "<=" while the external for loop uses "<"
• The code i++ will cause a syntax error
• Nothing is wrong with these nested for loops