In the given question,the given explicit formula is
[tex] a_{n) = 4+(n-1)(7) [/tex]
Which is of the form
[tex] a_{n} = a +(n-1)(d) [/tex]
So the constant difference is 7 here.
Now for the recursive formula
To find the next term, we need to add 7 to the current term, that is
[tex] a_{n} = a_{n-1} +7 [/tex]
So the correct option is B
