$\begin {array} {1 1} (a)\;Acceleration\: of\: the \: wire \; is\: 2\: m/s^2 & \quad (b)\;Acceleration\: of\: the \: wire \; is\: 1\: m/s^2 \\ (c)\;Acceleration\: of\: the \: wire \; is\: 0.5\: m/s^2 & \quad (d)\;Acceleration\: of\: the \: wire \; is\: 0\: m/s^2 \end {array}$