What activities do primary markets refer to (select all true statements)? a) Trading existing securities (existing bonds & stock) b) Trading new securities (new bonds & stock) c) Primary markets can be private d) Primary markets can be public What activities do secondary markets refer to (select all true statements)? a) Trading existing securities (existing bonds & stock) b) Trading new securities (new bonds & stock) c) Secondary markets can be private d) Secondary markets can be public What does the term IDO stand for