Steam is to be condensed in a shell and tube heat exchanger, $5$ m long with a shell diameter of $1$ m$.$ Cooling water is to be used for removing the heat. Heat transfer co$-$efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is

Vertical heat exchanger with steam on tube side

Vertical heat exchanger with steam on shell side

Horizontal heat exchanger with steam on tube side

Horizontal heat exchanger with steam on shell side