If all options are exercised, the deal would be worth $5 billion.

The companies even got a tax break when the options were exercised to buy stock.

The option can be exercised during a 30-day period at the end of the second year.

In many cases, the option can be exercised every five years.

The order could be worth about $1 billion if the options are exercised.

If the options are exercised, the order will be worth $6 billion.

But he added it was not clear when or how the option would be exercised.

If all options are exercised, the value of the contract would be about $256 million.

If options are exercised, work may continue through October 2011.

The contract's value could reach $450 million if all options are exercised.