The correct answer is A. record.
A tuple is a row in a table. It is a set of values that describes an entity. For example, a table of employees might have a tuple for each employee, with columns for the employee’s name, ID number, department, and salary.
A field is a column in a table. It is a single attribute of an entity. For example, the table of employees might have a field for the employee’s name, a field for the employee’s ID number, a field for the employee’s department, and a field for the employee’s salary.
A file is a collection of records. It is a physical storage unit for data. For example, a table of employees might be stored in a file on a hard drive.
A database is a collection of files. It is a logical storage unit for data. For example, a database of employees might contain files for all of the employees in a company.
A data item is the smallest unit of data. It is a single value that represents an attribute of an entity. For example, the employee’s name is a data item in the table of employees.