Qlik Alerting is the feature designed specifically for this use case. It allows a business analyst to configure data-driven alerts that actively monitor key performance indicators (KPIs). When the data crosses a predefined threshold, the system automatically triggers and sends a notification to specified users, such as the director, via email or the Qlik Sense mobile app. This proactive approach ensures that stakeholders are informed of critical changes in real-time without needing to be logged into the application, which is ideal for a director with limited time.

A. Weekly PDF report: This is a scheduled, static report. It does not provide immediate notification when a threshold is breached but only at a fixed interval.

B. Storytelling: This is a presentation feature within Qlik Sense used to build a narrative around data. It requires the user to actively open and view the story.

D. Bookmark: A bookmark saves a specific set of selections or a state within an application for later analysis. It is not a notification mechanism.

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1. Qlik Sense on Windows Help: Alerting. "With data alerting, you can easily monitor your charts and be notified when data changes. You can create alerts for charts in your apps. When the conditions for the alert are met, you are sent a notification." This directly supports the use of alerts for threshold-based notifications.

2. Qlik Sense on Windows Help: Creating an alert. This section details the process of setting up an alert, which includes defining a measure and setting a condition (e.g., "Value is greater than," "Value is less than"). This directly corresponds to the "threshold is breached" requirement in the question.

3. Qlik Sense on Windows Help: Distributing reports with subscriptions. This documentation explains that subscriptions are used to "regularly schedule a report for export and delivery." This confirms that reporting is time-based, not event-driven, making it unsuitable for the scenario.

4. Qlik Sense on Windows Help: Sharing insights with data storytelling. This source describes storytelling as a feature to "combine reporting, presentation, and exploratory analysis." It is an in-app presentation tool, not a proactive notification system.