adaptive methods like ode45 will always perform better than methods with a fixed step size like classical rk4. group of answer choices false: ode45 performs better only for 1st order odes. true: ode45 contains rk4 and rk5, and what can do more, can do less. false: ode45 can be too greedy for its own good. true: ode45 is adaptive, so it will definitely find a step size that improves upon rk4.