How does the Arc Consistency algorithm function in CSPs$?$

Select one:

a$)$By ensuring that for every pair of connected variables, each value in one variable's domain can be paired with at least one valid value in the other's domain.

b$)$By ensuring all variables are assigned a value before proceeding to enforce constraints.

c$)$By eliminating all values from variables' domains that have previously led to failures.

c$)$By assigning values that are least likely to conflict with future variable assignments.

d$)$By randomly selecting values from the domain to test the robustness of variable assignments.