Nature of number system conversions – UGC NET Question

Base conversion changes only the representation, not the underlying quantity. The numeric value must remain the same across bases.

Option A:
Option A is correct: the invariant is the numeric value.

Option B:
Option B is wrong because digits change between bases.

Option C:
Option C is wrong because the base is what changes.

Option D:
Option D is wrong because bit-length can change depending on base and range.