What are two ways to populate information to the Data Layer?

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What are two ways to populate information to the Data Layer?
(select all that apply)

·         Use code to pre-populate values in the Data Layer when a web page loads
·         Use Google AdWords to push information to the Data Layer
·         Use Google Analytics to push information to the Data Layer
·         Use a Javascript method to push values from your web page into the Data Layer
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.