To find customer names where the last name starts with Mc or MC, the correct queries are:

A. WHERE UPPER(SUBSTR(cust_name, INSTR(cust_name, ' ') + 1)) LIKE 'MC%'This query converts the substring of cust_name that comes after the first space (which should correspond to the last name) to uppercase and checks if it starts with 'MC', which will match both 'Mc' and 'MC'.

E. WHERE SUBSTR(cust_name, INSTR(cust_name, ' ') + 1) LIKE 'Mc%'This query checks if the substring of cust_name after the first space starts with 'Mc'. However, this query will only match last names that start with 'Mc' and not 'MC' unless the database is using a case-insensitive collation.

Options B, C, and D are incorrect:

B is incorrect because the syntax is not valid in Oracle SQL; the LIKE clause cannot be used to match multiple patterns in that way.

C is incorrect because INITCAP would not only capitalize the first letter of 'mc' or 'Mc' but would lowercase all other letters, which is not the intended action.

D is incorrect because, like option C, INITCAP is not the appropriate function for this use case and it will not correctly identify names that start with 'MC'.