The basic characteristic of a $$sequential data set$/$problem$,$ which is absent in non$-$sequence problems, is that:

$($Choose the option that captures the essence of a $$sequence$.)$

A sequence contains multiple elements that are fed to the network one by one in any order but not all at once.

The elements of a sequence can be reordered without affecting the sequence.

There is significant dependence between the elements of a sequence, and the order of the elements is important.