A team has discovered that when filling out applications, 25% have to be returned to the customer due to missing...

[answerhappygod]

A team has discovered that when filling out applications, 25% have to be returned to the customer due to missing information. Which of the following would be a basic root cause analysis technique to understand this error rate?

Review a sample of the applications to find out which fields are incomplete most often
Redesign the form and replace the old form
Ask the Project Sponsor for the next steps
Start calling the customers instead and fill out the form for them