Which of the following two sentences from the article include CENTRAL ideas from the article?
1. From witchy spells to military
symbols, hundreds of years of
human history are contained in
the carvings in the trees of
England's New Forest.
2. Visitors from around the world
can now explore the forest
virtually via a free digital display.
3. But in the early 19th century,
Great Britain shifted to using iron
and steel for its warships.
4. Its history dates back to the
years after the Norman
Conquest, around the 11th
century.