The answer can be 1 or 3. But the most appropriate solution is 1. Sending emails will not take the user to a state where they left on the website. This requires developer involvement.

Explanation
Querying contacts from the Einstein Engagement Frequency data extension when creating the send can be used to limit the number of emails a subscriber receives to a maximum of one email every 14 days. The Einstein Engagement Frequency data extension contains information about how often each subscriber engages with emails and what is their optimal send frequency. By filtering the data extension based on the optimal send frequency, the send can exclude subscribers who have already received an email within the last 14 days.
References:
https://help.salesforce.com/s/articleView?id=sf.mc_as_data_view_einstein_engagement_frequency.htm&type=5

Explanation
To unify the messaging and branding of communications while still allowing personalization and timing of campaigns, Northern Trail Outfitters and its subsidiaries should use Distributed Marketing. Distributed Marketing is a tool that allows marketers to create consistent and compliant messages in Marketing Cloud and distribute them to Sales Cloud or Service Cloud users for sending. Distributed Marketing allows Sales Cloud or Service Cloud users to personalize and schedule messages based on their customer interactions and preferences. References:
https://help.salesforce.com/s/articleView?id=sf.mc_dm_distributed_marketing.htm&type=5