mistakenly selected B1/B2 rather than B2

[Ashish Verma]

Hi,
I had filled DS 160 for my mother in law, I am sponsoring her. I want her to come on Visitor VISA
While filling DS 160, I selected B1/B2 category. Interview not yet scheduled. Only DS 160 has been filled.

Is this correct ? Or I should have selected B2?
Is there any way that I can change it from B1/B2 to only B2?
Or should I fill another DS 160? Can I fill another one?
Or should I continue with whatever I have filled? Is there any chance of any issue? If yes, I would like to change it or fill another form?
What should I select in VISA Class option for her while booking interview ?

Please help.

Thanks
Ashish