To answer this question, you need to understand the different applet types and their functionalities.
Option A) List - This option is correct because a List applet can simultaneously display more than one record. It is used to display a list of records from a specific business component. Each record is displayed as a row in the list and can be selected or manipulated individually.
Option B) Form - This option is incorrect because a Form applet displays a single record at a time. It is used to view or edit the details of a single record in a business component.
Option C) Child - This option is incorrect because a Child applet is used within a form applet to display related records from a child business component. It is used to show a set of records that are related to the main record being displayed in the form applet.
Option D) Detail - This option is incorrect because there is no applet type called "Detail" in the context of Siebel application development.
The correct answer is A) List. This option is correct because a List applet can simultaneously display more than one record.