X owes Rs. 10,000 to Y under a contract. It is agreed between X, Y & Z that Y shall henceforth accept Z as his debtor instead of X for the same amount. Old debt of X is discharged and a new debt from Z to Y is contracted. This is:

A. Invitation to offer B. Counteroffer C. Communication D. None of these

A. Is available to Y's representatives alone B. Is available to Z alone C. Is available to Y's representatives & Z both D. Is available to Y's representatives & after the death of Z, his representatives

A. Theory of unjust enrichment B. The right of lien C. Test of agency D. Doctrine of frustration

A. The active concealment of a fact by one having knowledge or belief of the fact B. A promise made without any intention of performing it C. The suggestion, as a fact, of that which is true, by one who does believe it to be true D. None above