Question: In R the operator ' $ ' is used to a . indicate income of a nation state in the state.x 7 7 data.frame available

In R the operator '$' is used to
a.indicate income of a nation state in the state.x77 data.frame available in baseR
b.extract columns of a data.frame by name
c. extract the columns of matrix stored in R
d.extract rows of a data.frame by row ame

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