Identity Matrix has identical number of rows and columns where its diagonals are defined as 1, which is shown below:
$$ I_k = \left[ \begin{array}{cccc} 1 & 0 & \cdots & 0\\ 0 & 1 & \cdots & 0\\ \vdots & \vdots & & \vdots\\ 0 & 0 & \cdots & 1\\ \end{array} \right] $$
Row 3 and 4 is not systematic as it doesn’t fulfil the property of being a Generator Matrix where \(G = [P|I^k]\) as there are discrepancies in Identity Matrix. Here, we XOR Row 3 with Row 1 in order to neutralise the 5th bit (which is 1) in order to make it systematic. Following the steps, we could get the final result systematic \(G\):