The method lets you add characters at a specific location within a stringbuilder object.
a.
append()
b.
charat()
c.
insert()
d.
setcharat()

insert()

Explanation:

StringBuilder is a dynamic object which is used to create the string without any size restriction.

let discuss the option:

option a: append()

It is a function which is used to append the two string. but it not add the character at specific location.

option b: charAt()

it is function which is used to get the character at specific location.

option c: insert()

It is a function which is used to add the character at specific location, it takes two parameter location and character.

option d: setCharAt()

it is a function which is use to update the character at specific location.

Therefore, the correct option is c.

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