Final answer:
In an IPPS-A query, the symbol for a wildcard search is A) %. It allows for flexible searching where characters may vary, which is useful in database querying.
Step-by-step explanation:
The symbol used in an IPPS-A query to conduct a wildcard search is A) %. This symbol allows users to perform searches where one or more characters may be unknown or variable. For instance, in a search query, using the percentage symbol would allow for the return of all records that match a certain pattern, regardless of what characters come after or before the pattern. This is particularly useful in database queries where exact values might not be known or you are seeking a range of results that share a common characteristic.