Answer:
Period(.)
Step-by-step explanation:
Option A is rejected because exclamation mark is not used in programming languages to reference an array but it is used as Operator to mark if the value is NOT
For example
if(x!=2)
this statement check if the x variable is NOT EQUAL TO 2.
Option B is rejected because it is used in objects for the languages which use them as key value pairs
for example :
IN java script objects are like :
const person = {
name : 'Asad',
id : 1
}
Option C is rejected because it is used to slect all the records of some data structure.
for example in database to select all the records of a row we write:
select * from table_name where id=1;
Option D is selected because Period references to the nested values of the array if the index is the parent value.