Question

which statement below best describes the characteristics of an undecidable problem?
the problem is poorly phrased, so cannot be understood by a computer program.
heuristic methods are unable to be used to find a reasonable solution the problem.
no algorithm can be constructed that always leads to a correct solution to the problem.
the problem involves data sets which are so large that it is impracticable to run an algorithm to find the solution.

Explanation:

An undecidable problem in computer science is one for which no algorithm can be constructed that always gives a correct yes - or - no answer. It's not about poor phrasing, inapplicability of heuristics, or large data sets. The key issue is the non - existence of a general algorithm for a correct solution.

Answer:

No algorithm can be constructed that always leads to a correct solution to the problem.