We will be getting two different grouping..
Grouping 1 (9,8)
GROUPING 2 (9,10)
Both the grouping are correct representation of the function . f(xyzw)
( PS: There were statements decribing dont cares in many of the comments
""once you have assumed a don't care as '1' u can't use the same don't care for grouping zeros and vice versa"
" if dont care has been used in pos than can't be used in sop "
Both these statements are wrong . Don't care simply means just Dont care , say we use dont care d3 for grouping 1 in SOP we can use d3 for grouping 0 in POS. the literals in SOP and POS May not be same )
K Map- is not unique . And the question says about minimal literals . So the best answer would be (9,8) Since there is no option in GATE we can go with (9,10)