Correct Answer : All of the above
Explanation :
The following are some of the essential tools required for tracking the status of email marketing:
Open Rate (must range in between 18% - 25%)
Bounce Rate (must range in between 8% - 12%)
Deliverability Rate (must range in between 85% - 90%)
Conversion Rate (must range in between 5% - 10%)
Unsubscribe Rate (must be 0.25%)