DS-160 - Purpose of Trip - Confusion in Sub Category - Help Required

[vn1295]

Hi,
I am planning to apply visitor visa for my parents. During the DS-160 filling, I have selected the purpose of the trip to the US as "TEMP BUSINESS PLEASURE VISITOR(B)". After that there is sub category we need to specify. there i have the three below options.
BUSINESS& TOURISM(TEMPROARY VISITOR)(B1/B2)
BUSINESS/CONFERENCE(B1)
TOURISM/MEDICAL TREATMENT(B2).

Now am confused whether to select the option 1 or 3 ?

If anyone share their idea it will be helpful for me.

Thanks in Advance.

[jnk]

Select option 1. (B1/B2)