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In one of the pairs of protocols given below , both the protocols can use multiple $\textsf{TCP}$ connections between the same client and the server. Which one is that?

  1. $\textsf{HTTP, FTP}$
  2. $\textsf{HTTP, TELNET}$
  3. $\textsf{FTP, SMTP}$
  4. $\textsf{HTTP, SMTP}$
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$\textsf{SMTP:}$ only one $\textsf{TCP}$ connection.

$\textsf{TELNET:}$ only one $\textsf{TCP}$ connection.

$\textsf{HTTP:}$ Multiple connections can be used for each resource.

$\textsf{FTP: FTP}$ uses Telnet protocol for Control info on a $\textsf{TCP}$ connection and another $\textsf{TCP}$ connection for data exchange

So, the answer is A. 

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