Based on the spot price of $26 and the strike price $28 as well as the fact that the risk-free interest rate is 6% per annum with continuous compounding, please undertake option valuations and answer related questions according to following instructions:

Binomial trees:

Additionally, assume that over each of the next two four-month periods, the share price is expected to go up by 11% or down by 10%.

1. Use a two-step binomial tree to calculate the value of an eight-month European call option using the no-arbitrage approach.
2. Use a two-step binomial tree to calculate the value of an eight-month European put option using the no-arbitrage approach.
3. Show whether the put-call-parity holds for the European call and the European put prices you calculated in a. and b.
4. Use a two-step binomial tree to calculate the value of an eight-month European call option using risk-neutral valuation.
5. Use a two-step binomial tree to calculate the value of an eight-month European put option using risk-neutral valuation.
6. Verify whether the no-arbitrage approach and the risk-neutral valuation lead to the same results.
7. Use a two-step binomial tree to calculate the value of an eight-month American put option.
8. Calculate the deltas of the European put and the European call at the different nodes of the binomial tree.

Note:When using no-arbitrage arguments, you need to show in detail how to set up the riskless portfolios at the different nodes of the binomial tree.

This is all the information needed to answer this question with no information missing.