Which of the Following Is Correct with Regard to the Pricing

Which of the following is correct with regard to the pricing of new products?
There are two basic strategies available: follow-the-leader and price leadership.
Price skimming is more effective than penetration pricing.
Penetration pricing is generally more effective than price skimming.
Price skimming involves trying to sell a new product only to customers with the highest income levels.
Penetration pricing is designed to stimulate trial purchase.