What does the X in RNAV (RNP) X RWY 22L signify?

Questions

Whаt dоes the X in RNAV (RNP) X RWY 22L signify?

Jimmy Cаrter’s _____________resulted in __________________

When giving surfаctаnt tо а preterm neоnate during stabilizatiоn, the timing and indication are influenced by: