The speed of execution is not part of the SQL standard.
ISO SQL is a standard, and not a product. Thus, it cannot be "installed" as such.
SQL*PLUS is ORACLE's implementation of ISO SQL, and includes some extensions to ISO SQL to better utilize features of ORACLE.
The ISO standard of SQL is the industrial standard definition of SQL. ORACLE's implementation of that standard is called SQL*PLUS.
SQL*PLUS is indeed a product, while ISO SQL is a standard and not a product.
Which of the following best describes the relation between ISO SQL and ORACLE's SQL*PLUS?