This question runs in a pre-configured Salesforce environment - no personal connection required.
Given a list of Contact record IDs, set the Department field to "Inactive" for all of them using a single DML update operation. Query the contacts first using the provided IDs, set Department = "Inactive" on each, then perform a bulk update. If the list is empty, do nothing.
Examples:
Input: (no return value - modifies org data)
contactIds = [Id1, Id2, Id3]
Before: Contact Id1.Department = "Sales", Id2.Department = "Marketing", Id3.Department = null
After: Contact Id1.Department = "Inactive", Id2.Department = "Inactive", Id3.Department = "Inactive"
Explanation: All three contacts are updated in a single DML call
contactIds = []
Before/After: No change
Explanation: Empty list results in no DML operation
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