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Which algorithm efficiently calculates the single source shortest paths in a Directed Acyclic Graph?

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Which algorithm efficiently calculates the single source shortest paths in a Directed Acyclic Graph?

(a) topological sort

(b) hash table

(c) binary search

(d) radix sort

The question was asked in class test.

Query is from Different Path in a Graph in section Graphs of Discrete Mathematics

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Right option is (a) topological sort

The best I can explain: For Directed Acyclic graph, single source shortest distances can be calculated in O(V+E) time. For that purpose Topological Sorting can be used. Topological Sorting of any graph represents a linear ordering of the graph.

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