Which of the following sequence is correct as per Aufbau principle?

The Aufbau principle states that lower energy levels will occupy first, followed by higher energy levels.
Additionally, the orbital with the fewest $(\mathrm{n}+\mathrm{l})$ will be filled first according to the $(\mathrm{n}+\mathrm{l})$ rule.

$\begin{array}{cccc}\text{ Orbital }& n& 1& n+1\\ 1s& 1& 0& 1\\ 2p& 2& 1& 3\\ 4s& 4& 0& 4\\ 3d& 3& 2& 5\end{array}$

the Aufbau principle dictates the proper order as a result.

$1s<2p<4s<3d$.