a) counter(name,style)
b) counter(name)
c) counter(string)
d) counter(name,string,style)

Answer: c
Explanation: There are two functions for specifying counters, ‘counter()’ or ‘counter()’. First one has two forms ‘counter(name,style)’ and ‘counter(name)’. The second one also has two forms ‘counter(name,string,style)’ and ‘counter(name,string)’.