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StAX may consume as much memory as DOM ?

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DOM API is known for consuming big memories since all data in the XML document are loaded in XML content tree before parsing.
I found out there is a possibility that StAX API may consume as much as memory as DOM API.

The reason why I ask because in EPractice lab, a question "A company needs to process DOM documents received from its customers through an EJB 3 endpoint.
Which of the following APIs will a developer need to invoke to process these DOM documents"
Select 2:
F StaX.

The given answer is JAXP and StAX.
(I think DOM API in JAXP should be included in the choice as well.)
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