What is a difference between a DoS attack and DDos attack?

What is a difference between a DoS attack and DDos attack?
A. A DoS attack is where a computer is used to flood a server with TCP packets, whereas DDoS attack is where a computer is used to flood a server with UDP packets.
B. A DoS attack is where a computer is used to flood a server with UDP packets, whereas DDoS attack is where a computer is used to flood a server with TCP packets.
C. A DoS attack is where a computer is used to flood a server with TCP and UDP packets, whereas DDoS attack is where a computer is used to flood multiple servers that are distributed over a LAN.
D. A DoS attack is where a computer is used to flood a server with TCP and UDP packets, whereas DDoS attack is where multiple systems target a single system with a DoS attack.

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