Which of the following accurately reflects the Tokugawa shogunate?
a. The shogunate was able to unite all but the northernmost island, Hokkaido.
b. Samurai became the officially sanctioned military arm of the Japanese ruler.
c. The samurai continued to innovate weaponry and military tactics throughout the existence of the shogunate.
d. The Ainu of Hokkaido were able to defeat the shogunate by spreading native diseases.
e. The shogunate was a dynasty handed down to the most powerful shogun in the land.