In a(n) primary, registered voters can vote in either party's primary but cannot vote in both primaries.

In a(n) open primary, registered voters can vote in either party's primary but cannot vote in both primaries.

Explanation:

Open primary is defined as "a direct primary election in which voters need not meet a test of party membership"

And satisfy the condition that registered voters can vote in either party's primary but cannot vote in both primaries.

answer; bonds; i believe this is the correct answer good luck