(a) False. SMTP (Simple Mail Transfer Protocol) is designed for sending outgoing emails, not for receiving incoming emails. For receiving incoming emails, a different protocol like POP3 (Post Office Protocol version 3) or IMAP (Internet Message Access Protocol) is used.
(b) True. The two wildcard characters commonly used with the LIKE clause in SQL are '*' (asterisk) to match zero or more characters and '?' (question mark) to match a single character.
(c) True. In a while loop, the loop condition is checked at the beginning of the loop, and if it evaluates to true, the loop's body is executed. If the condition is false, the loop terminates.
(d) True. In encapsulation, an object's internal details and implementation are hidden from the outside world, and only a controlled and limited interface is exposed, allowing access to the essential and relevant information. This is a fundamental concept in object-oriented programming, such as in languages like Java and C++, where you use access modifiers like private, protected, and public to control visibility and access to an object's members.