the color of which的使用方法

There are 12 umbrellas in the doorway, the color of which is blue.

老师这句话中的the名词ofwhich用的对吗？是只须替换color就都可以用吗？有哪些应该注意的吗？

以下三种表达都正确：

There are 12 umbrellas in the doorway, the color of which is blue. （定语从句）

There are 12 umbrellas in the doorway, whose color is blue.（定语从句）

There are 12 umbrellas in the doorway, and their color is blue.（并列句）