In rookie scale contracts, which of the following is true about extending contracts?

In the context of rookie scale contracts, the ability to extend contracts hinges on certain criteria being met, which is why the chosen answer is accurate. Rookie scale contracts are structured agreements for first-round draft picks, and extensions can only be granted based on specific performance metrics and player development benchmarks.

Teams typically have to adhere to established guidelines, such as the player's time in the league, performance, and the overall salary cap implications. If a player has exhibited significant growth, played a crucial role on the team, or demonstrated potential for further development, the team may have the option to negotiate an extension.

The other options do not align with the realities of rookie scale contracts. For instance, players do have the ability to negotiate salary under certain conditions, contracts cannot be extended indefinitely as they are subject to league regulations and salary cap restrictions, and extensions are not solely dependent on trades but rather on satisfactory performance evaluations and contractual guidelines.