Which of the following carbocations is expected to be most stable?

$A$ certain reaction occurs in two steps as:
$(i)$ $2 SO_{2(g)} + 2 NO_{2(g)} \rightarrow 2 SO_{3(g)} + 2 NO_{(g)}$
$(ii)$ $2 NO_{(g)} + O_{2(g)} \rightarrow 2 NO_{2(g)}$
In the reaction,

The stability of the following carbocations follows the order:

Identify the most stable carbocation from the following:

The correct order of stability of the carbocations given below is:

Which is the most stable carbocation?