Answer:
One page ( 1 )
Step-by-step explanation:
Direct mail questionnaires should be kept at a maximum of one ( 1 ) page because mail questionnaires are meant to get information from prospective clients or relevant public about an existing goods and services or a prospective good or service to be rendered. it can also be used to get relevant information on a topic to be researched on
study have shown that many people become uninterested in direct questionnaires that are more than one (1) page long and do not attend to them. whether direct mail or otherwise. A direct mail questionnaire should contain a cover note introducing the topic on research.