Question: Considering Create, Read, Update and Delete ( CRUD ) , for which type of database is the correct approach for reading to delegate as below:

Considering Create, Read, Update and Delete (CRUD), for which type of database is the correct approach for reading to delegate as below:
.on("value",(snapshot)=>{});
Question 2 options:
Firebase real time database
All NOSQL databases
SQL/RDBMS
POUCH

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