The sliding contact bearing, according to the thickness layer of lubricant between bearing and journal are mentioned as follows:

1. Thick Film Bearing:

• The thick film bearings are those in which the working surfaces are completely separated from each other by the lubricant.
• They are also known as hydrodynamics lubricated bearing.

2. Thin Film Bearing:

• The thin film bearings are those in which, although lubricant is present, the working surface partially contact each other at least part of the time.
• They are also known as boundary lubricated bearings.

3. Zero Film Bearing:

• The zero film bearings are those which operate without any lubricant present.

4. Hydro-static Bearing:

• The hydro-static bearings are those which can support steady loads without any relative motion between the journal and the bearing, therefore it is suitable for carrying heavy loads.
• This is achieved by forcing externally pressurized lubricant between the members.
• hey are also known as externally pressurized lubricant bearing.
  

Hence, the correct option is (D).