Match the column named 'Components of Mail System' with the column named 'Description'.

Components of Mail System		Description
a	Email client	i	Stores incoming mail until the user retrieves it.
b	Mail server	ii	A software application used by the end-user to send, receive, and read email messages.
c	SMTP server	iii	Handles the sending of emails using the Simple Mail Transfer Protocol.
d	IMAP server	iv	Manages and maintains user mailboxes and processes incoming and outgoing mail.