Which of the Following Is True of a Sequential Design

Which of the following is true of a sequential design in the context of mixed methods designs?

A) Within-subjects experimental designs are followed by between-subjects experimental designs.
B) One focus follows a second focus, and the two are relatively independent from one another.
C) Qualitative and quantitative data are collected simultaneously.
D) The data interpretation, analysis, collection, and design levels of interface occur simultaneously.