What is referred to in the term ‘good’ cholesterol?

cholesterol stored in cell walls
cholesterol used in the formation of steroids
low-density lipoproteins (ldl)
high-density lipoproteins (hdl)

Jessica said she would never work for less than $12 an hour, but then she got a job looking after children in the afternoon, and it pays only $6 an hour. now she says that money isn't as important as enjoying her work. this is an example of: apex