Identify the correct order of the components with reference to their arrangement from outer side to

Hi, I have a question and I hope anyone could answer it:

Identify the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stern. 

1. Secondary cortex 

2. Autumn wood 

3. Secondary phloem

4. Phellem 

(a) 2,3, 1,4 

(b) 3,4,2,1 

(c) 4, 1,3,2 

(d) 1,2,4,3