CREATE TABLE table_23905 ("School" CLOB, "Location ( s ) " CLOB, "Control" CLOB, "Type" CLOB, "Accreditation" CLOB, "Founded" CLOB, "Enrollment" CLOB)

What is the control type which was founded in 1991?
SELECT "Control" FROM table_23905 WHERE "Founded" = '1991'
SELECT "Control" FROM "table_23905" WHERE "Founded" = '1991'