Question: When originating a call using the `D>` command with `<str>` (alphanumeric field) in a UE, which of the following best describes how the corresponding phone number is located?
Option 1: The UE searches only the ME (Mobile Equipment) memory for a matching alphanumeric field.
Option 2: The UE searches all available memories (MT, SIM/UICC, and TA) for a matching alphanumeric field, if possible.
Option 3: The UE relies on the last selected phonebook storage (set by `+CPBS`) to find the matching alphanumeric field.
Option 4: The UE requires both `<str>` and `<n>` (entry location) to be specified to identify the correct phone number.
Explanation: According to direct dialling from phonebooks specifications, when using the `D><str>[I][G][;]` command, the UE should search all available memories (if possible) for a phonebook entry with an alphanumeric field matching `<str>`, ensuring flexibility and comprehensive search across different storage types.