What Is the CORRECT Way to Classify the Protein Below $\beta$

Multiple Choice

What is the CORRECT way to classify the protein below according to its secondary-structure elements?

A) all $\beta$
B) $\alpha$ + $\beta$
C) $\alpha$ / $\beta$ 0
D) $\beta$ / $\alpha$ / $\beta$
E) $\alpha$ / $\beta$ / $\alpha$