Johnson is an incident handler and is working on a recent web application attack faced by his organization. As part of this process, he performed data preprocessing in order to analyze and detect the watering hole attack. Johnson preprocessed the outbound network traffic data collected from firewalls and proxy servers. He then started analyzing the user activities within a certain time period to create time ordered domain sequences to perform further analysis on sequential patterns. Identify the data-preprocessing step performed by Johnson.

Johnson is an incident handler and is working on a recent web application attack faced by his organization. As part of this process, he performed data preprocessing in order to analyze and detect the watering hole attack. Johnson preprocessed the outbound network traffic data collected from firewalls and proxy servers. He then started analyzing the user activities within a certain time period to create time ordered domain sequences to perform further analysis on sequential patterns. Identify the data-preprocessing step performed by Johnson.
A . User-specific sessionization
B . Identifying unpopular domains
C . Hostname normalization
D . Filtering invalid hostnames

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Answer: A