What is causing the error?

A developer creates a global page load rate that loads on all page views and uses data elements that are mapped to a page data layer. After initial testing of the rule, the developer notices that the rule does not execute. The developer sees the following error in the browser console: ‘data layer is not defined*.

What is causing the error?
A . The data layer will not be defined on the page until_satellite.pageBottom() has executed.
B . The DTM header code is deployed after the data layer so it is not defined when the global page load rule executes.
C . The DTM header code is deployed before the data layer so it is not defined when the global page load rule execute.
D . The data layer is not defined because _satellite.pageBottom() is not set on the page.

Answer: A