What does lower camel case notation involve?

Lower camel case notation involves capitalizing each word in a phrase except for the first word, which remains in lowercase. This formatting style is often used in programming and variable naming to make the names more readable while still being concise. For example, the phrase "lower camel case" would be written as "lowerCamelCase". This convention helps in differentiating between words without using spaces, making it particularly useful in contexts where spaces are not allowed, such as variable names in many programming languages.

The other options represent different naming styles but do not align with the definition of lower camel case. Capitalizing all words corresponds to title case; leaving all letters lowercase would maintain a uniform appearance that doesn't enhance readability; and using underscores to separate words describes a different convention known as snake case.