1.) What is the size of the string "Hello World"? What is thelength of this array named s?char s[ ] = "Hello world";a) Write a c program that returns the length of s to supportyour answer.b) Define a string instance called s1, copy the string "HelloWorld" in s1 then use the string length function to determine thelength of s1 and display itI am lost, mostly on parts a and b. Any help would beappreciated. Thanks!