Explanation
The correct answer is B, because the element will unset a token named my_token. The element is used to remove the value of a token based on a user interaction, such as a click or a change. The token attribute specifies the name of the token to be unset. The other options are incorrect because they will not unset a token named my_token. The mytoken element is invalid, because the token name should not be enclosed in dollar signs. The false and disabled elements will not unset the token, but set its value to false or disabled, respectively.

Explanation
The correct answer is B, C, and D, because they are all valid parent elements for the event action shown below. The event action is a <set> element, which is used to set the value of a token based on a user interaction, such as a click or a change. The <set> element can be nested inside a <change>, a <condition>, or a <drilldown> element, depending on the type and context of the event. The <eval> element is not a valid parent element for the <set> element, but a sibling element that can be used to evaluate an expression and set the value of a token.

Explanation
A Splunk custom visualization is a visualization that uses the Splunk Custom Visualization API. This API lets you create your own visualizations using JavaScript, HTML, and CSS. You can also use third-party libraries or frameworks to create custom visualizations. The other options are not custom visualizations, but rather variations of the built-in visualizations in Splunk. For more information, see [Custom visualizations overview].

Explanation
The navigation options that will be displayed to the end user are Search, Datasets, and Dashboards. This is because the local file overrides the default file, and the local file does not include the Reports view. For more information, see Configure navigation.