What correction is needed for an "Invalid boolean" error?

The correct answer addresses the nature of a boolean data type, which is specifically designed to hold one of two values: often represented as true/false, yes/no, or 1/0. An "Invalid boolean" error typically indicates that the data being used does not conform to these expected values.

When a boolean field is expected to contain a true or false value (or its equivalent), but instead contains something that doesn't meet that criteria—like text or numbers—it results in an error. By changing the data to a YES or NO format, it aligns the input with the valid definitions of boolean values. This correction will satisfy the requirements of the boolean field and resolve the error.

Considering the other options, changing the data to a numeric value or removing the boolean field entirely does not rectify the issue; instead, they either misalign the data type or eliminate the necessary functionality. Modifying the field type to text would also lead to ignoring the requirement for boolean data, which directly contradicts the intended use of that field. Hence, using YES or NO properly resolves the error by conforming to the boolean standard.