Easiest way to achieve it is to tick the box create individual tasks for all group members.

Nintex will then send individual tasks to each member of the group. You still can keep all the approval modes like first answer and so on.

Once a group member approved/rejected you can read it's name from the last task respondent variable.

Kind regards,

Enrico

Hi NIDHIN C‌,

Another way is to same the Approve Task ID in a List Item ID workflow variable and use Query List action on the Workflow Task list to get the approver based on the ID.

For Nintex WF for office 365. 

1. start a task process

2. For Each

3. Query List