Pick the wrong statement about recumbent fold.

• A. It has the arch, which is zone of curvature
• B. It has the shell, which is the inner zone, made up of mostly igneous rocks
• C. It has the shell, which is the outer zone, made up of mostly sedimentary rocks
• D. It has the core, which is the innermost zone, maybe made up of igneous rocks and metamorphic rocks