MDI is used to work as . . . . . . . . , its main property is mdi child , all the forms are open within MDI

The correct answer is: B. child

MDI stands for Multiple Document Interface. It is a user interface pattern that allows multiple documents to be opened and displayed within a single parent window. The parent window is called the MDI parent, and the child windows are called MDI child windows.

The main property of MDI is that it allows users to switch between multiple documents without having to close and reopen them. This can be useful for tasks such as editing multiple documents at the same time or comparing different versions of a document.

MDI is often used in applications that require users to work with multiple documents, such as word processors, spreadsheets, and presentation software.

Here is a brief explanation of each option:

• A. parents – This is not the correct answer because MDI child windows are not parents. MDI child windows are the documents that are opened and displayed within the MDI parent window.
• B. child – This is the correct answer because MDI child windows are the documents that are opened and displayed within the MDI parent window.
• C. form – This is not the correct answer because MDI child windows are not forms. Forms are used to create user interfaces, while MDI child windows are used to display documents.
• D. menu – This is not the correct answer because MDI child windows are not menus. Menus are used to provide users with a way to interact with an application, while MDI child windows are used to display documents.