What action should be used to pass a conversion attribute (such as shipping cost)?

What action should be used to pass a conversion attribute (such as shipping cost)?

• Set up Custom Floodlight Variable using bulksheets
• Set up Custom Floodlight Variable using the relevant engine frontend
• Set up an additional Floodlight tag and pass the shipping cost through the revenue field
• Set up Custom Floodlight Variable as a metric

Correct answer is:

Set up Custom Floodlight Variable as a metric