According to IIA guidance on IT, which of the following would be considered a primary...

Comprehensive and Detailed In-Depth Explanation:

Primary controls in spreadsheet management focus on ensuring data accuracy, integrity, and security.

Option A (Locking formulas and static data) prevents unauthorized changes, ensuring data integrity. This is a direct control over spreadsheet accuracy, making it the correct answer.

Option B (Backup storage) is an IT operational control, not a primary financial reporting control.

Option C (Documentation of spreadsheet use) is important for governance but does not directly prevent errors.

Option D (Version control software) helps manage changes but does not directly ensure financial reporting accuracy.

Thus, locking and protecting spreadsheet formulas is the most critical primary control for accurate financial reporting.