A conductor has a non-uniform section as shown in the figure. A steady current is flowing through it. Then the drift speed of the electrons

Question

$\begin {array} {1 1} (1)\;varies\: unpredictably & \quad (2)\;increases \: from\: P\: to\: Q \\ (3)\;decreases\: from\: P\: to\: Q & \quad (4)\;is\: constant\: throughout\: the\: wire \end {array}$