⟩ How many different layouts are available in Reports6i? What are they? in which sequence , form level trigger will fire? in which sequence, report trigger will fire? how many types of canvas are there in form? what r they? what are bind variables and lexical reference in oracle reports? how many types of colums are there in Reports6i? what are they? what is the purpose of placeHolder column in Report? can u have a form with out a canvas? what is confine mode and flex mode in reports? how do u register report in oracleApps?