Final answer:
The 'Group Mask' in a program header represents a pattern or set of values used to apply an operation to multiple elements. In the given example, the asterisks (*) represent wildcard or don't care conditions.
Step-by-step explanation:
Within a program header, the 'Group Mask' represents a pattern or set of values used to apply a certain operation to a group of elements. In the given example, [1, *, *, *, *, *, *, *], the asterisks (*) imply a wildcard or don't care condition, meaning that any value is acceptable in those positions. So, the 'Group Mask' intends to match any element that starts with '1' in the first position and can have any values in the remaining positions.