Which p's of marketing 4Ps or 6 or 7Ps?

Now a days we follow which p's of marketing 4Ps or 6 or 7Ps?

Please note that the organizations' mainly falling in the goods sector are following 4 P's while developing their marketing strategies whereas service sector organization's are following 7 P's because of their service nature. For example, for a mobile brand, organization needs to identify the product (which is mobile), its acceptable price, target market location (the place) and its promotional tools like print or electronic advertisement. They don't necessarily need to establish an eye catching environment (the physical evidence) etc. On the other side, a restaurant needs to adopt 7 P's where the attractive environment (physical evidence), behavior of the employees (people), and process are very important.