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Question

A system is commonly defined as a group of interacting units or elements that have a common purpose. We call a system as a closed one, when it
(a) has no proper order
(b) exchanges materials with surroundings
(c) does not exchange materials with surroundings
(d) is constantly changing in composition

A
(a) and (d)
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B
(b) only
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C
(a) and (c)
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D
(b) and (d)
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