The Verification Activity is precisely designed for this two-part requirement: it evaluates the staging data extension against a defined row-count threshold (over 1,000 records) immediately after the Import activity runs, and if that threshold is breached, it can simultaneously send an email notification to the marketing manager and halt the automation before it proceeds to the subsequent SQL Query step. Placing it directly between the Import and SQL Query activities ensures that if the staging data is over-imported, the automation stops right there — preventing the downstream SQL Query from ever populating the sendable data extension that day, satisfying both stated requirements (notification and prevention of the sendable DE update) with a single, native activity requiring no custom development. Option C proposes writing a custom SSJS script to replicate this exact functionality manually, which is unnecessary and less maintainable than using the native, purpose-built Verification Activity that already provides both the conditional check and notification capability out of the box. Option B, splitting into two automations, does not itself provide the conditional row-count evaluation and stop logic — it ' s a structural change that doesn ' t solve the underlying validation requirement. Option D ' s Wait Activity pauses for time-based delay, not conditional record-count validation, and does not address the requirement at all. Reference: Automation Studio Verification Activity.