In the soil classification system, is order the highest and most broad rank, and subgroup the lowest ...

In the soil classification system, is order the highest and most broad rank, and subgroup the lowest and
  most specific rank?

Soil taxonomy is based on properties of the soil as they can be observed in the field or laboratory.
  Does it include a hierarchical grouping to show how the levels relate?

Was the current USDA classification system originally published in 1960, modified and republished in
  1979, and had Gelisols added to it in 1998?

Is land damage a result of poor land policies that came to the attention of public leaders in the United
  States around 1850?

a. soil limitations
  b. soil ratings
  c. color areas
  d. destination directions

a. a farmer
  b. a civil engineer
  c. a landscape designer
  d. an interior designer