Data model attributes are fields that are added to a dataset from search time field extractions, calculated fields,
lookups, or aliases. They can be created within the data model editor or inherited from a parent dataset. They
can be edited or removed unless they are required by the data model. They can be added to any type of dataset,
not just root search datasets.ReferencesSee About data models, [Define data model attributes], and [Edit data
model datasets] in the Splunk Documentation.

Reference:
https://docs.splunk.com/Documentation/Splunk/8.0.3/Knowledge/Usesearchmacros

Reference: https://docs.splunk.com/Documentation/Splunk/8.0.3/Knowledge/definecalcfields Calculated fields are fields that are created by performing calculations on existing fields using the eval command. Calculated fields can be used in the search bar to filter and transform events based on the calculated values. Calculated fields can also be based on an extracted field, which is a field that is extracted from raw data using various methods, such as regex, delimiters, lookups, etc. Calculated fields are not shortcuts for performing calculations using the eval command, but rather results of performing calculations using the eval command. Calculated fields can be applied to any field in Splunk, not only host and sourcetype.
Therefore, statements A, B, and D are true about calculated fields.

In Splunk, you can create an event type from the search window by running a search that would make a good
event type, then clicking Save As and selecting Event Type1. This opens the Save as Event Type dialog, where
you can provide the event type name and optionally apply tags to it1.
You can also create an event type by editing the eventtypes.conf file and adding a new stanza1. Each stanza in
the eventtypes.conf file represents an event type1. The stanza name isthe name of the event type, and
the search attribute specifies the search string that defines the event type1.
It's important to note that while you can use the eventtype command in a search to find events associated with
a specific event type, adding | eventtype to the SPL and executing the search does not create a new event
type1. Similarly, clicking Event Actions > Build Event Type in an event's detail dropdown does not create a
new event type1.