Ans is C
Reliability is the probability of failure-free operation of a system over a specified time within a specified environment for a specified purpose
Robustness is the ability of a computer system to cope with errors during execution and cope with erroneous input.
Correctness of an algorithm is asserted when it is said that the algorithm is correct with respect to a specification
Accuracy of a measurement system is the degree of closeness of measurements of a quantity to that quantity's true value