You are working as a network engineer with an ISP $($Internet Service Provider$).$ A query has come to you from a client who requires a guarantee of minimum uptime percentages if the service goes down. Which one of the following will you choose in this scenario?

a$.$

Broadband

b$.$

DIA $($Dedicated Internet Access$)$

c$.$

DSL $($Digital Subscriber Line$)$

d$.$

PSTN $($Public Switched Telephone Network$)$