Its optional. Either of the two can draw as per his/her admissiblity and the other the rest (Total Rs.6000). In that case they will again have to give option in July,2018. In such case it is wise to fix @ Rs.3000 for each.
I have one query. In case husband in working in a different state in a PSU company, and is staying there in lease accommodation, and not taking any HRA, what will be the HRA admissibility of wife?