Refer to figure.
RNP Approach (RNP APCH). RNP APCH can be performed in 3 different ways, to 3 different minima

• LNAV only is a non-precision approach (similar to a VOR approach) using GNSS.
• LNAV/VNAV uses GNSS plus a barometric VNAV* system to give vertical guidance on the approach, and is a 3-dimensional (3D) approach with lower minimums than LNAV only.
• LPV minimums are even lower, as low as 200ft due to the narrowing effect of the allowed track (like a localiser), and the incredibly accurate position data - and integrity - is gained by using SBAS augmentation to the GNSS signal, it is also a 3D approach standard.

The 3D approaches here are not precision approaches, they sit somewhere in between non-precision and precision, and are called APV approaches, Approaches with Vertical Guidance.

*Baro-VNAV is the minimum that can be used, but there is "backwards compatibility" in RNP APCH, so the more accurate SBAS can be used to perform an approach down to LNAV/VNAV minima, if the state publishing the procedure allows it.

NOTE:
This question has had to be changed in the past due to incorrect/incomplete feedback, so any exam feedback for this would be greatly appreciated, and can be placed in the comments, or emailed to [email protected], thank you.