Pick out the wrong statement pertaining to a shell and tube heat exchanger.

The minimum value of baffle spacing is $50$ mm

The maximum value of baffle spacing is equal to the I.D$.$ of the shell

The maximum unsupported tube span is generally about $75$ times tube diameter, but is reduced to about $60$ times for aluminium, copper & alloys of these

Disk and doughnut baffle is the most commonly used baffle