Explanation
The relationship between data models and pivots is that data models provide the datasets for pivots. Data models are collections of datasets that represent your data in a structured and hierarchical way. Data models define how your data is organized into objects and fields. Pivots are user interfaces that allow you to create data visualizations that present different aspects of a data model. Pivots let you select options from menus and forms to create charts, tables, maps, etc., without writing any SPL code. Pivots use datasets from data models as their source of data. Pivots and data models are not the same thing, as pivots are tools for visualizing data models. Pivots do not provide datasets for data models, but rather use them as inputs.
Therefore, only statement A is true about the relationship between data models and pivots.

To create a macro that accepts arguments, you must include the number of arguments in parentheses at the end of the macro name1. For example, my_macro(3) is a macro that accepts three arguments. The number of arguments in the macro name must match the number of arguments in the definition1. Therefore, option A is correct, while options B, C and D are incorrect.

The Field Extractor (FX) is a tool that helps you extract fields from your events using a graphical
interface2. You can create a report using a custom field extracted by the FX and share it with other users in
your organization2. However, if another user runs the shared report and no results are returned, there could be
two possible reasons. One reason is that the extraction is private, which means that only you can see and use
the extracted field2. To make the extraction available to other users, you need to make it global or app-level2.
Therefore, option C is correct. Another reason is that the other user does not have access to the index where
the events are stored2. To fix this issue, you need to grant the appropriate permissions to the other user for the
index2. Therefore, option D is correct. Options A and B are incorrect because they are not related to the field
extraction or the report.

Reference:https://answers.splunk.com/answers/574643/field-showing-an-additional-and-not-visible-value-1.html
To use a macro in a search, you must enclose the macro name and any arguments in single quotation marks1.
For example, 'my_macro(arg1,arg2)' is a valid way to use a macro with two arguments. You can use macros
anywhere in your search string where you would normally use a search command or expression1. Therefore,
options A and C are valid searches that use macros, while options B and D are invalid because they do not
enclose the macros in single quotation marks.

Explanation
The data model command allows you to run searches on data models that have been accelerated1. The syntax for using the data model command is | datamodel <model_name> <dataset_name> [search <search_string>]1.
Therefore, option A is the correct way to use the data model command to search fields in the data model within the web dataset. Options B and C are incorrect because they do not follow the syntax for the data model command. Option D is incorrect because it does not use the data model command at all.