The configuration that should help with limiting a spike in volume to the website is Send Throttle1. Send Throttle allows you to specify the number of emails to send per hour, which can help you control the traffic to your website and avoid overwhelming your server or exceeding your bandwidth limit2. By using Send Throttle, you can also improve your email deliverability and avoid being flagged as spam by ISPs that monitor sudden spikes in email volume3.
Sender Authentication Package is not the correct answer, as it does not help with limiting a spike in volume to the website. Sender Authentication Package is a feature that helps you authenticate your email sender identity and domain, which can improve your email reputation and deliverability4. However, it does not affect the rate or timing of your email sends.
Web Collect Sign-Up Form is also not the correct answer, as it does not help with limiting a spike in volume to the website. Web Collect Sign-Up Form is a feature that helps you collect email subscribers from your website, which can increase your email list size and engagement. However, it does not affect the rate or timing of your email sends. References := 1: Send Throttle - Salesforce 2: Marketing Cloud Email Specialist Certification Guide & Tips 3: Email limitations in marketing cloud - Salesforce Developer Community 4:
Sender Authentication Package - Salesforce : Web Collect Code Samples - Salesforce