किस रक्त समूह वाले व्यक्ति को सार्वभौमिक दाता (यूनिवर्सल डोनर) माना जाता है?

A person with blood group AB positive is identified as a 'Universal Recipient' because their plasma lacks which of the following?

Which blood group is known as the universal donor?

Which blood group is considered the universal recipient?