A method to deteremine whether a subquery is correlated or non$-$correlated is by observing if: $($choose the most comprehensive answer$)$

a column from the table of the main query is in the subquery

a column in the WHERE clause of the main query is in the subquery

a column in the SELECT clause of the subquery is in the main query

a column in the SELECT clause of the main query is in the subquery