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It is deemed best practice to always use Option Explicit in VBA as it forces the developer to declare all their variables before use. This has other benefits too, such as auto-capitalization for declared variable names and IntelliSense. Option Explicit Sub OptionExplicit() Dim a As Integer ...

Option Compare Binary Binary comparison makes all checks for string equality within a module/class case sensitive. Technically, with this option, string comparisons are performed using sort order of the binary representations of each character. A < B < E < Z < a < b < e < z ...

Option Base is used to declare the default lower bound of array elements. It is declared at module level and is valid only for the current module. By default (and thus if no Option Base is specified), the Base is 0. Which means that the first element of any array declared in the module has an index...