Explanation
A REST Data Source with ORDS as the REST Data Source Type is based on an AutoREST-enabled table or view on a remote Oracle Database. AutoREST enables you to perform CRUD (Create, Read, Update, Delete) operations on a table or view using standard HTTP methods. When a user updates an employee record in an editable interactive grid that uses this REST Data Source as source, the PUT operation defined in the REST Data Source is utilized to update a record in the EMP table on the remote Oracle Database. The PUT operation sends an HTTP PUT request to the REST endpoint with the primary key value of the record and the updated column values in JSON format. Verified References: Creating REST Data Sources - Oracle Help Center, Oracle REST Data Services (ORDS) : AutoREST - Oracle-Base

Explanation
To hide a few columns in your interactive report, you should choose Columns from the Actions menu. This option allows you to select which columns to show or hide in your report by using checkboxes. You can also reorder or resize the columns from this option.
The other options are incorrect because:
Filter allows you to filter the data in your report by applying one or more conditions on the columns.
Data allows you to add, modify, or delete data in your report by using inline editing or modal dialog editing.
Format allows you to change the appearance of your report by applying conditional formatting rules or highlighting colors.
Verified References: [Customizing Interactive Reports] [Actions Menu]

Explanation
Search configuration is a shared component that defines the data source to be searched and the way results should be displayed. You can create a search configuration based on a local data source (table or SQL query), an APEX list, a REST enabled SQL service, or a REST data source2. You can use one or more search configurations in a search page, depending on the search type you select. For example, you can use multiple search configurations for a standard search, but only one search configuration for an Oracle TEXT or a list search2.

Explanation
The Column Heading menu of an Interactive Report provides various options to customize the report based on the selected column. The options include:
Control Break: This option allows you to create a control break on the column, which groups the rows by the column values and inserts a header and a footer for each group. You can also apply aggregate functions, such as sum, count, or average, to the footer of each group.
Hide: This option allows you to hide the column from the report, which reduces the clutter and improves the readability of the report. You can also show the hidden columns by using the Columns option in the Actions menu.
The other options are incorrect because:
Group By: This option is not provided in the Column Heading menu of an Interactive Report. It is provided in the Actions menu of an Interactive Report. It allows you to group the rows by one or more columns and display the result in a chart or a pivot table.
Delete: This option is not provided in the Column Heading menu of an Interactive Report. It is provided in the Data option in the Actions menu of an Interactive Report. It allows you to delete one or more rows from the report and the underlying table.
Verified References: [Customizing Interactive Reports] [Column Heading Menu]

Explanation
A page item is a component that is part of an HTML form and can accept user input or display output. There are many types of page items that can be placed on a page in APEX, such as text fields, text areas, radio groups, checkboxes, date pickers, select lists, popup LOVs, shuttles, and so on. Each type of page item has different properties and attributes that affect its appearance and functionality. Three of the types of page items that can be placed on a page are:
Checkbox: A checkbox is a page item that displays one or more options that can be selected or deselected by the user. A checkbox can have either static values or dynamic values based on a list of values (LOV). A checkbox can also have different display styles, such as pill button or switch.
Date Picker: A date picker is a page item that displays a text field with an icon that opens a calendar popup when clicked. A date picker allows users to enter or select a date value in a specific format. A date picker can also have different attributes, such as minimum or maximum date, display format, or time picker.
Select List: A select list is a page item that displays a drop-down list of options that can be selected by the user. A select list can have either static values or dynamic values based on a list of values (LOV). A select list can also have different attributes, such as multiple selection, null value display text, or cascading LOV.