When Determining If a Question Is Necessary,in Some Situations It

When determining if a question is necessary,in some situations it may be necessary to ask questions that are not directly related to the information that is needed.Which of the reasons stated below were given in your text as reasons why questions not related to the information needed might be included in the questionnaire?

A) to disguise the purpose or sponsorship of the project
B) to generate client support for the project
C) to establish involvement and rapport
D) all of the above