Why does dns use udp instead of tcp? if a dns packet is lost, there is no automatic recovery. what are the consequences?

According to alisa miller foreign news bureaus

Assume that there is a 4% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on three independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?

Which is the highest level of the hierarchy of needs model? a. humanity b. intrapersonal c. team d. interpersonal