Which of the following is not true about the drug development process?

1Most molecules that are considered as potential drugs get approval to be produced and sold

2The time it takes from the discovery phase until a potential drug reaches the market is around 10-14 years

3The estimated cost of research and development per approved drug is $2.6 billion

4 A potential drug must demonstrate safety and efficacy through clinical trials to be considered for approval to be produced and sold