The correct option is Viva Insights add in for Outlook.

The Outlook add in integrates directly with your Outlook calendar and it provides tools to book protected time and plan personal time away, so it is the appropriate feature to schedule personal time off. The add in lets you create calendar events and block focus or quiet time from within Outlook which makes scheduling time away straightforward.

Briefing emails from Viva in Outlook is incorrect because briefing emails provide summaries and suggestions about your day and they do not let you directly schedule calendar time or block personal time away.

Viva Insights app in Teams is incorrect because the Teams app surfaces personal insights and wellbeing recommendations but it does not directly create calendar bookings in the way the Outlook add in does.

Viva Insights dashboard in the Microsoft 365 admin center is incorrect because admin dashboards show organizational level analytics and settings for admins and they are not used by an individual to schedule personal time off.

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