**minimize the following using K-Map and implement using universal gates**

**f=sum of m( 2,3,6,7,8,10,11,13,14)**

My book has given a different solution like this.

https://prnt.sc/jdyj4n

I have solved this way

My solution :

https://prnt.sc/jdyk0kI have solved this way

My solution :

https://prnt.sc/jdyk0k

My book has given a different solution like this.

https://prnt.sc/jdyj4n

Am I doing it wrong? Which solution is correct? I am stuck right here. Need help.