Why Buddha attain Parinibbana in fourth Jhana?

I just wonder why Buddha attain Parinibbana in fourth Jhana.
Why not first or say second Jhana.
https://www.accesstoinsight.org/tipitak … .than.html

It is said that breathing ceases in the fourth jhana:
“When one has attained the fourth jhāna, in-and-out breathing has been stilled.”—SN 36.11, Thanissaro.

But Buddha emerged from the fourth Jhana before Parinibbana.
Further discussion in DW.