What is double hashing used for in computer science and data structures?a)Resolving collisions in hash tables.b)Generating random numbers.c)Doubling the size of an array.d)Hashing a value twice for added security.

Double hashing is used for resolving collisions in hash tables in computer science and data structures. Here's a step-by-step explanation:

1. Hashing is a technique used in computer science to convert any size input in a fixed size output. It's used in hash tables for quickly locating a data record given its search key.

2. Sometimes, two different keys could hash to the same index. This is known as a collision.

3. Double hashing is one of the methods used to resolve these collisions. In double hashing, a secondary hash function is used for probing whenever a collision occurs.

4. The main idea of double hashing is to make the interval between probes (also known as the "step size") variable instead of constant. This helps in better distributing the keys and reduces the chance of clustering.

5. So, if the primary hash function results in a collision, we use a secondary hash function to find another slot to review. We continue this process until we find an empty slot or until we have scanned the entire table.

So, the correct answer to your question is a) Resolving collisions in hash tables.