In which of the following cases would you want to use a connection$-$oriented service instead of a connectionless service?

a$.$ When you want to allow users to log in remotely

b$.$ When you want to perform a series of database queries

c$.$ When you want to establish a system for outward data dissemination

d$.$ When you need users to do real$-$time applications like video streaming

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Fiber cable comes in two forms, multi$-$mode and single$-$mode. Which of the following is a difference between the two?

a$.$ Single$-$mode is cheaper to install, while multi$-$mode has a higher bandwidth

b$.$ Single$-$mode is best for LAN applications, while multi$-$mode is best for WAN applications

c$.$ Single$-$mode requires a laser as the light source, while multi$-$mode can use an LED as the light source

d$.$ Single$-$mode is suitable for distances up to a mile, while multi$-$mode is suitable for distances over $40$ miles

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