Arthur Vandelay and his two business partners have been steadily building their importing$/$exporting company. They've recently received a few large contracts that required them to expand their importing efforts, and they want to expand their customer base to help keep the importing at full capacity. Arthur, the IT specialist in the company, decided to invest in a Salesforce subscription so that he$,$ his business partners, and their sales reps can better track their efforts. Arthur already has a website running in AWS and wants to set up Single Sign On $($SSO$)$ from his AWS account to his Salesforce account. Which protocol makes this possible?

Choose an option below and explain your answer in $3-5$ sentences:

a$.$ AAA

b$.$ SSH

c$.$ PKI

d$.$ SAML