Devops tectnical interview understanding script

Hi dont know what you have been told about devops and cloud technology but whatever it was it cannot exclude the ability to write , read and interpret code script. Now let's go . You were given the following script below in technical interview

Now the question

a. What is the intention of the below script

b. Replace A,B,C,D,E and F with the right words

c. Having done No2, how can you optimized this script suggest ways to go about this base on your experience

---

 - hosts: all
   become: A
   tasks:

   - name: install apache Ubuntu servers
     apt:
       name:
         - B
       state: C
       update_cache: yes


   - name: install apache on CentOS servers
     D:
       name:
         - E
       state: F
       update_cache: yes