Answer:
The correct answer would be ATCGGA.
It can be explained with the help of the complementary nature of the two strands of the DNA.
Complementary nature refers to the property of the DNA by which the nitrogenous base pairs of the two strands are always complementary to each other, that is, thymine always base-pairs with adenine.
Similarly, cytosine always base-pairs with guanine.
So, if the nucleotide sequence of strand would be TAGCCT then the nucleotide sequence of other strand would be ATCGGA.