In a replica set, a_________number of members ensures that the replica set is always able to select a primary.

Question

Options

• AEven
• BOdd
• C2

• A
  10% (3)
• B
  87% (27)
• C
  3% (1)

Explanation

An odd number of members ensures a replica set can always elect a primary because elections require a majority vote (more than half of all voting members). With an odd count like 3, 5, or 7, one side will always have a clear majority even if nodes fail or become partitioned.

Why A (Even) is wrong: An even number of members risks a split-vote scenario - for example, with 4 members, a network partition could create two groups of 2, and neither side can claim a majority, leaving the set without a primary.

Why C (2) is wrong: Two is a specific even number and inherits the same majority problem - if one member fails, the remaining member holds only 1 of 2 votes (50%), which does not meet the majority threshold needed to elect a primary.

Memory tip: Think "odd wins elections" - just like a tiebreaker in voting, an odd number of members guarantees someone always gets the majority, preventing deadlock.

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