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 connection-oriented protocol UDP is not reliable and is a connectionless protocol
B. TCP is not reliable and is a connection-oriented protocol; UDP is reliable and is a connectionless protocol
C. TCP is not reliable and is a connectionless protocol; UDP is reliable and is a connection-oriented protocol
D. TCP is reliable and is a connectionless protocol; UDP is not reliable and is a connection-oriented protocol

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Answer: A