Which of the following compounds is (are) symmetrical ethers? 
Definitions:
Infant Hearing
The ability of infants to perceive and process sounds, which begins before birth and is crucial for language development and social interactions.
Mother's Voice
The sound produced by a mother that is uniquely recognizable by her offspring, often providing comfort and security.
House Cat
A domesticated feline kept as a pet or for catching vermin, and not of a specific breed.
Tiger
A large carnivorous cat native to Asia, known for its stripes and powerful physique.
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