At Westonci.ca, we provide reliable answers to your questions from a community of experts. Start exploring today! Get the answers you need quickly and accurately from a dedicated community of experts on our Q&A platform. Join our Q&A platform to connect with experts dedicated to providing accurate answers to your questions in various fields.

Say you have a long string and you want to collect all of the letters within it without storing duplicates. What would be the most appropriate type to store the letters in?
a. a set
b. a list
c. the original string
d. a dictionary