What is the difference regarding reliability and communication type between TCP and UDP?

What is the difference regarding reliability and communication type between TCP and UDP?
A . TCP is reliable and is a connectionless protocol; UDP is not reliable and is a connection-oriented protocol.
B . TCP is not reliable and is a connectionless protocol; UDP is reliable and is a connection-oriented protocol.
C . TCP is not reliable and is a connection-oriented protocol; UDP is reliable and is a connectionless protocol.
D . TCP is reliable and is a connection-oriented protocol; UDP is not reliable and is a connectionless protocol.

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Answer: D