What are some of the major characteristics of ballet's classical period?

Ballet's classical period's major characteristics include ballets with precise, intricate movements and rigorous technique. For example, significant pointe work, high extensions and turnout of the legs. Marius Petipa's work on Tchaikovsky's 'Swan Lake', 'Sleeping Beauty', and 'The Nutcracker, typify the period, leading to Petipa's nickname as 'the father of classical ballet'.

The answer is all of the above.