Which one of the following facts constitutes a Contingent Contract?

Where a salt lake was offered by way of lease on deposit of a sum of money within a specified period

Acceptance of a tender for up to 1000 tons of coal to be supplied as and when any order is placed during the financial year

When a bank offers a locker to its customer subject to the condition that the customer makes a fixed deposit of rupees one lac with the bank before the end of the month