Which of the following statements about semaphores is true?
a) P and V operations should be indivisible operations.
b) If several threads attempt a P( S ) operation simultaneously, only one thread should be allowed to proceed.
c) A semaphore implementation should guarantee that threads do not suffer indefinite postponement.
d) all of the above
d) all of the above
Computer Science & Information Technology
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In which type of wireless attack does the attacker cause valid users to lose their connections by sending a forged deauthentication frame to their stations?
A. association flood B. jamming C. session hijacking D. MAC address spoofing
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