What is the size of the following structure in C++: struct Employee { int id; char name[20]; float salary; };

In C++, the size of a structure is determined by the sum of the sizes of its individual members, taking into account padding for alignment. The Employee structure consists of three members: an integer id, an array of characters name of size 20, and a float salary.

The size of an integer is typically 4 bytes, the size of a float is also typically 4 bytes, and the size of each character in the array depends on the character set being used (usually 1 byte per character). However, due to memory alignment requirements, additional padding may be added after the name array to ensure proper alignment of subsequent members.

So, the calculation of the structure size would be:

int id: 4 bytes
char name[20]: 20 bytes
Padding to align salary to the next 4-byte boundary (assuming 4-byte alignment)
float salary: 4 bytes

Total: 4 bytes (id) + 20 bytes (name) + 4 bytes (padding) + 4 bytes (salary) = 32 bytes.

Therefore, the correct answer is Option D: 32 bytes.