In what kind of structure for strings, one can easily insert, delete, concatenate and rearrange sustrings?

Variable length storage with fixed maximum

In what kind of structure for strings, one can easily insert, delete,

1.	In what kind of structure for strings, one can easily insert, delete, concatenate and rearrange sustrings?
A.	Fixed length storage structure
B.	Variable length storage with fixed maximum
C.	Linked list storage
D.	Relocatable structure
Answer» D. Relocatable structure