GCP Mock exam about App Engine

Today i tried GCP mock exam one of the question and answer seems incorrect.

the question is "You are designing the logging structure for a non-containerized Java application that will run on GAE. Which of the following options is recommended and will use the least number of steps to enable your developers to later access and search logs?"

for this question i have selected

"Have the developers write log lines to stdout and stderr"

but correct ans shows "Have the developers write logs using the App Engine Java SDK"

it seems incorrect please refer following link

https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/appengine-java8/search/src/main/java/com/example/appengine/search/DeleteServlet.java

https://cloud.google.com/appengine/docs/standard/java11/writing-application-logs

please let me know if am missing something