To answer this question, you need to understand how sign is stored in Packed Decimal fields. Let's go through each option to understand why it is correct or incorrect:
Option A) Sign is stored as a hex value in the last nibble of the storage. - This option is correct. In Packed Decimal fields, the sign is typically stored as a hex value in the last nibble (4 bits) of the storage. The sign is represented by the values 0xF (positive) or 0xC (negative).
Option B) Sign is over punched with the numeric value stored in the last nibble. - This option is incorrect. Overpunching is a technique used in some older systems to represent sign, where the sign is represented by overpunching the last digit with a special character. However, in Packed Decimal fields, the sign is stored as a separate hex value in the last nibble.
Option C) Sign is stored in the most significant bit. - This option is incorrect. While the most significant bit can be used to represent sign in some other data storage formats, it is not used to store sign in Packed Decimal fields.
Option D) None of the above - This option is incorrect. The correct answer is option A, as explained above.
The correct answer is A. This option is correct because sign is indeed stored as a hex value in the last nibble of the storage in Packed Decimal fields.