What are the default values for GRE tunnel keeplive time and number of retries?

What are the default values for GRE tunnel keeplive time and number of retries?

A.
5 seconds and 3 retries

B.
10 seconds and 5 retries

C.
10 seconds and 3 retries

D.
20 seconds and 5 retries

E.
5 seconds and 5 retries