A mass of M kg is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of $45^{\circ}$ with the initial vertical direction is\\
(1) $Mg(\sqrt{2} - 1)$\\
(2) $Mg(\sqrt{2} + 1)$\\
(3) $Mg\sqrt{2}$\\
(4) $\frac{Mg}{\sqrt{2}}$