Question: What is the difference between ls and ls - a commands? a . ls - a lists all files including hidden files, whereas ls only

What is the difference between ls and ls -a commands?
a. ls -a lists all files including hidden files, whereas ls only lists visible files
b. ls -a lists visible files only, whereas ls lists all files including hidden files
c. ls and ls -a commands are the same and list all files including hidden files
d. ls and ls -a commands are the same and list visible files only

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