The parameters needed for a MySQL database connect string are

a

host name

b

user name

c

password

d

All of the above

d. All of the above.

Explanation:

The parameters required to for a MYSQL database connect string are as following:-

Host Name. User Name. Password. New link. Client flags.

So among the given options all of them are required and those are host name, user name, password.

Hence the answer to this question is option d all of the above.