Relative dating methods are used to determine the age of an object or layer in comparison to others. These methods do not provide an exact age, but instead place items in a chronological sequence.
- Radiocarbon Dating, Fission-track dating, and K-Ar Dating are all absolute dating methods, meaning they provide a specific age or date range based on isotopic measurements.
- Stratigraphy is a relative dating method that involves studying the layers of earth (strata) to determine the relative age of objects or fossils found in different layers.
Final Answer:
\[
\boxed{\text{The correct answer is (4) Stratigraphy.}}
\]